来用我写的东西好了, import java.io.*;public class Format { public Format(String s) { width = 0; precision = -1; pre = ""; post = ""; leading_zeroes = false; show_plus = false; alternate = false; show_space = false; left_align = false; fmt = ' ';
int state = 0; int length = s.length(); int parse_state = 0; // 0 = prefix, 1 = flags, 2 = width, 3 = precision, // 4 = format, 5 = end int i = 0;
while (parse_state == 0) { if (i >= length) parse_state = 5; else if (s.charAt(i) == '%') { if (i < length - 1) { if (s.charAt(i + 1) == '%') { pre = pre + '%'; i++; } else parse_state = 1; } else throw new java.lang.IllegalArgumentException(); } else pre = pre + s.charAt(i); i++; } while (parse_state == 1) { if (i >= length) parse_state = 5; else if (s.charAt(i) == ' ') show_space = true; else if (s.charAt(i) == '-') left_align = true; else if (s.charAt(i) == '+') show_plus = true; else if (s.charAt(i) == '0') leading_zeroes = true; else if (s.charAt(i) == '#') alternate = true; else { parse_state = 2; i--; } i++; } while (parse_state == 2) { if (i >= length) parse_state = 5; else if ('0' <= s.charAt(i) && s.charAt(i) <= '9') { width = width * 10 + s.charAt(i) - '0'; i++; } else if (s.charAt(i) == '.') { parse_state = 3; precision = 0; i++; } else parse_state = 4; } while (parse_state == 3) { if (i >= length) parse_state = 5; else if ('0' <= s.charAt(i) && s.charAt(i) <= '9') { precision = precision * 10 + s.charAt(i) - '0'; i++; } else parse_state = 4; } if (parse_state == 4) { if (i >= length) parse_state = 5; else fmt = s.charAt(i); i++; } if (i < length) post = s.substring(i, length); } /** prints a formatted number following printf conventions @param fmt the format string @param x the double to print */
public static void printf(String fmt, double x) { System.out.print(new Format(fmt).format(x)); } /** prints a formatted number following printf conventions @param fmt the format string @param x the int to print */ public static void printf(String fmt, int x) { System.out.print(new Format(fmt).format(x)); } /** prints a formatted number following printf conventions @param fmt the format string @param x the long to print */ public static void printf(String fmt, long x) { System.out.print(new Format(fmt).format(x)); } /** prints a formatted number following printf conventions @param fmt the format string @param x the character to print */
public static void printf(String fmt, char x) { System.out.print(new Format(fmt).format(x)); } /** prints a formatted number following printf conventions @param fmt the format string @param x a string to print */
public static void printf(String fmt, String x) { System.out.print(new Format(fmt).format(x)); } /** Converts a string of digits (decimal, octal or hex) to an integer @param s a string @return the numeric value of the prefix of s representing a base 10 integer */
public static int atoi(String s) { return (int)atol(s); }
/** Converts a string of digits (decimal, octal or hex) to a long integer @param s a string @return the numeric value of the prefix of s representing a base 10 integer */
public static long atol(String s) { int i = 0; while (i < s.length() && Character.isWhitespace(s.charAt(i))) i++; if (i < s.length() && s.charAt(i) == '0') { if (i + 1 < s.length() && (s.charAt(i + 1) == 'x' || s.charAt(i + 1) == 'X')) return parseLong(s.substring(i + 2), 16); else return parseLong(s, 8); } else return parseLong(s, 10); } private static long parseLong(String s, int base) { int i = 0; int sign = 1; long r = 0;
while (i < s.length() && Character.isWhitespace(s.charAt(i))) i++; if (i < s.length() && s.charAt(i) == '-') { sign = -1; i++; } else if (i < s.length() && s.charAt(i) == '+') { i++; } while (i < s.length()) { char ch = s.charAt(i); if ('0' <= ch && ch < '0' + base) r = r * base + ch - '0'; else if ('A' <= ch && ch < 'A' + base - 10) r = r * base + ch - 'A' + 10 ; else if ('a' <= ch && ch < 'a' + base - 10) r = r * base + ch - 'a' + 10 ; else return r * sign; i++; } return r * sign; }
/** Converts a string of digits to a <tt>double</tt> @param s a string */
public static double atof(String s) { int i = 0; int sign = 1; double r = 0; // integer part double f = 0; // fractional part double p = 1; // exponent of fractional part int state = 0; // 0 = int part, 1 = frac part
while (i < s.length() && Character.isWhitespace(s.charAt(i))) i++; if (i < s.length() && s.charAt(i) == '-') { sign = -1; i++; } else if (i < s.length() && s.charAt(i) == '+') { i++; } while (i < s.length()) { char ch = s.charAt(i); if ('0' <= ch && ch <= '9') { if (state == 0) r = r * 10 + ch - '0'; else if (state == 1) { p = p / 10; r = r + p * (ch - '0'); } } else if (ch == '.') { if (state == 0) state = 1; else return sign * r; } else if (ch == 'e' || ch == 'E') { long e = (int)parseLong(s.substring(i + 1), 10); return sign * r * Math.pow(10, e); } else return sign * r; i++; } return sign * r; }
/** Formats a <tt>double</tt> into a string (like sprintf in C) @param x the number to format @return the formatted string @exception IllegalArgumentException if bad argument */
public String format(double x) { String r; if (precision < 0) precision = 6; int s = 1; if (x < 0) { x = -x; s = -1; } if (fmt == 'f') r = fixed_format(x); else if (fmt == 'e' || fmt == 'E' || fmt == 'g' || fmt == 'G') r = exp_format(x); else throw new java.lang.IllegalArgumentException();
return pad(sign(s, r)); } /** Formats an integer into a string (like sprintf in C) @param x the number to format @return the formatted string */
public String format(int x) { long lx = x; if (fmt == 'o' || fmt == 'x' || fmt == 'X') lx &= 0xFFFFFFFFL; return format(lx); }
/** Formats a long integer into a string (like sprintf in C) @param x the number to format @return the formatted string */
public String format(long x) { String r; int s = 0; if (fmt == 'd' || fmt == 'i') { if (x < 0) { r = ("" + x).substring(1); s = -1; } else { r = "" + x; s = 1; } } else if (fmt == 'o') r = convert(x, 3, 7, "01234567"); else if (fmt == 'x') r = convert(x, 4, 15, "0123456789abcdef"); else if (fmt == 'X') r = convert(x, 4, 15, "0123456789ABCDEF"); else throw new java.lang.IllegalArgumentException();
return pad(sign(s, r)); }
/** Formats a character into a string (like sprintf in C) @param x the value to format @return the formatted string */
public String format(char c) { if (fmt != 'c') throw new java.lang.IllegalArgumentException(); String r = "" + c; return pad(r); }
/** Formats a string into a larger string (like sprintf in C) @param x the value to format @return the formatted string */
public String format(String s) { if (fmt != 's') throw new java.lang.IllegalArgumentException(); if (precision >= 0 && precision < s.length()) s = s.substring(0, precision); return pad(s); }
/** a test stub for the format class */
public static void main(String[] a) { double x = 1.23456789012; double y = 123; double z = 1.2345e30; double w = 1.02; double u = 1.234e-5; int d = 0xCAFE; Format.printf("x = |%f|\n", x); Format.printf("u = |%20f|\n", u); Format.printf("x = |% .5f|\n", x); Format.printf("w = |%20.5f|\n", w); Format.printf("x = |%020.5f|\n", x); Format.printf("x = |%+20.5f|\n", x); Format.printf("x = |%+020.5f|\n", x); Format.printf("x = |% 020.5f|\n", x); Format.printf("y = |%#+20.5f|\n", y); Format.printf("y = |%-+20.5f|\n", y); Format.printf("z = |%20.5f|\n", z);
Format.printf("s = |%-20s|\n", "Hello"); Format.printf("s = |%-20c|\n", '!'); // regression test to confirm fix of reported bugs Format.printf("|%i|\n", Long.MIN_VALUE); Format.printf("|%6.2e|\n", 0.0); Format.printf("|%6.2g|\n", 0.0); Format.printf("|%6.2f|\n", 9.99); Format.printf("|%6.2f|\n", 9.999); Format.printf("|%6.0f|\n", 9.999);
d = -1; Format.printf("d = |%X|\n", d); }
private static String repeat(char c, int n) { if (n <= 0) return ""; StringBuffer s = new StringBuffer(n); for (int i = 0; i < n; i++) s.append(c); return s.toString(); } private static String convert(long x, int n, int m, String d) { if (x == 0) return "0"; String r = ""; while (x != 0) { r = d.charAt((int)(x & m)) + r; x = x >>> n; } return r; } private String pad(String r) { String p = repeat(' ', width - r.length()); if (left_align) return pre + r + p + post; else return pre + p + r + post; }
private String sign(int s, String r) { String p = ""; if (s < 0) p = "-"; else if (s > 0) { if (show_plus) p = "+"; else if (show_space) p = " "; } else { if (fmt == 'o' && alternate && r.length() > 0 && r.charAt(0) != '0') p = "0"; else if (fmt == 'x' && alternate) p = "0x"; else if (fmt == 'X' && alternate) p = "0X"; } int w = 0; if (leading_zeroes) w = width; else if ((fmt == 'd' || fmt == 'i' || fmt == 'x' || fmt == 'X' || fmt == 'o') && precision > 0) w = precision;
return p + repeat('0', w - p.length() - r.length()) + r; }
private String fixed_format(double d) { boolean removeTrailing = (fmt == 'G' || fmt == 'g') && !alternate; // remove trailing zeroes and decimal point if (d > 0x7FFFFFFFFFFFFFFFL) return exp_format(d); if (precision == 0) return (long)(d + 0.5) + (removeTrailing ? "" : "."); long whole = (long)d; double fr = d - whole; // fractional part if (fr >= 1 || fr < 0) return exp_format(d); double factor = 1; String leading_zeroes = ""; for (int i = 1; i <= precision && factor <= 0x7FFFFFFFFFFFFFFFL; i++) { factor *= 10; leading_zeroes = leading_zeroes + "0"; } long l = (long) (factor * fr + 0.5); if (l >= factor) { l = 0; whole++; } // CSH 10-25-97
String z = leading_zeroes + l; z = "." + z.substring(z.length() - precision, z.length()); if (removeTrailing) { int t = z.length() - 1; while (t >= 0 && z.charAt(t) == '0') t--; if (t >= 0 && z.charAt(t) == '.') t--; z = z.substring(0, t + 1); } return whole + z; } private String exp_format(double d) { String f = ""; int e = 0; double dd = d; double factor = 1; if (d != 0) { while (dd > 10) { e++; factor /= 10; dd = dd / 10; } while (dd < 1) { e--; factor *= 10; dd = dd * 10; } } if ((fmt == 'g' || fmt == 'G') && e >= -4 && e < precision) return fixed_format(d);
d = d * factor; f = f + fixed_format(d);
if (fmt == 'e' || fmt == 'g') f = f + "e"; else f = f + "E"; String p = "000"; if (e >= 0) { f = f + "+"; p = p + e; } else { f = f + "-"; p = p + (-e); }
return f + p.substring(p.length() - 3, p.length()); }
private int width; private int precision; private String pre; private String post; private boolean leading_zeroes; private boolean show_plus; private boolean alternate; private boolean show_space; private boolean left_align; private char fmt; // one of cdeEfgGiosxXos }import java.awt.*; import java.awt.event.*; import javax.swing.*; import javax.swing.text.*; import javax.swing.event.*; public class CustomTextFormator extends PlainDocument { private String strAllowChar =null; private int intMaxLength =0; private int intDataType=0; private int intPricesion=0; public static final int INTEGER_TEXT=1; public static final int FLOAT_TEXT=2; public static final int DATE_YEAR=3; public static final int DATE_MONTH=4; //--- Construct Function public CustomTextFormator(int intMaxLength) { super(); this.intMaxLength = intMaxLength; } //---- public CustomTextFormator(int intMaxLength, String strCharList) { super(); this.intMaxLength = intMaxLength; this.strAllowChar = strCharList; } //---- public CustomTextFormator(int intMaxLength, int intDataType) { super(); this.intMaxLength = intMaxLength; this.intDataType = intDataType; if(intDataType == this.INTEGER_TEXT) this.strAllowChar = "-1234567890"; else if(intDataType == this.DATE_YEAR) this.strAllowChar = "1234567890"; else if(intDataType == this.DATE_MONTH) this.strAllowChar = "1234567890"; else if(intDataType == this.FLOAT_TEXT) this.strAllowChar = "-1234567890."; } //---- public CustomTextFormator(int intMaxLength, int intDataType, int intPricesion) { super(); this.intMaxLength = intMaxLength; this.intDataType = intDataType; if(intDataType == this.INTEGER_TEXT) this.strAllowChar = "-1234567890"; else if(intDataType == this.FLOAT_TEXT) this.strAllowChar = "-1234567890."; this.intPricesion = intPricesion; } //==== Check Function Panel === public void insertString(int offset, String s, AttributeSet attributeSet) throws BadLocationException
Just try it, you'll know. :)
import java.io.*;public class Format
{
public Format(String s)
{ width = 0;
precision = -1;
pre = "";
post = "";
leading_zeroes = false;
show_plus = false;
alternate = false;
show_space = false;
left_align = false;
fmt = ' ';
int state = 0;
int length = s.length();
int parse_state = 0;
// 0 = prefix, 1 = flags, 2 = width, 3 = precision,
// 4 = format, 5 = end
int i = 0;
while (parse_state == 0)
{ if (i >= length) parse_state = 5;
else if (s.charAt(i) == '%')
{ if (i < length - 1)
{ if (s.charAt(i + 1) == '%')
{ pre = pre + '%';
i++;
}
else
parse_state = 1;
}
else throw new java.lang.IllegalArgumentException();
}
else
pre = pre + s.charAt(i);
i++;
}
while (parse_state == 1)
{ if (i >= length) parse_state = 5;
else if (s.charAt(i) == ' ') show_space = true;
else if (s.charAt(i) == '-') left_align = true;
else if (s.charAt(i) == '+') show_plus = true;
else if (s.charAt(i) == '0') leading_zeroes = true;
else if (s.charAt(i) == '#') alternate = true;
else { parse_state = 2; i--; }
i++;
}
while (parse_state == 2)
{ if (i >= length) parse_state = 5;
else if ('0' <= s.charAt(i) && s.charAt(i) <= '9')
{ width = width * 10 + s.charAt(i) - '0';
i++;
}
else if (s.charAt(i) == '.')
{ parse_state = 3;
precision = 0;
i++;
}
else
parse_state = 4;
}
while (parse_state == 3)
{ if (i >= length) parse_state = 5;
else if ('0' <= s.charAt(i) && s.charAt(i) <= '9')
{ precision = precision * 10 + s.charAt(i) - '0';
i++;
}
else
parse_state = 4;
}
if (parse_state == 4)
{ if (i >= length) parse_state = 5;
else fmt = s.charAt(i);
i++;
}
if (i < length)
post = s.substring(i, length);
} /**
prints a formatted number following printf conventions @param fmt the format string
@param x the double to print
*/
public static void printf(String fmt, double x)
{ System.out.print(new Format(fmt).format(x));
} /**
prints a formatted number following printf conventions @param fmt the format string
@param x the int to print
*/ public static void printf(String fmt, int x)
{ System.out.print(new Format(fmt).format(x));
} /**
prints a formatted number following printf conventions @param fmt the format string
@param x the long to print
*/ public static void printf(String fmt, long x)
{ System.out.print(new Format(fmt).format(x));
} /**
prints a formatted number following printf conventions @param fmt the format string
@param x the character to print
*/
public static void printf(String fmt, char x)
{ System.out.print(new Format(fmt).format(x));
} /**
prints a formatted number following printf conventions @param fmt the format string
@param x a string to print
*/
public static void printf(String fmt, String x)
{ System.out.print(new Format(fmt).format(x));
} /**
Converts a string of digits (decimal, octal or hex) to an integer @param s a string
@return the numeric value of the prefix of s representing a base 10 integer
*/
public static int atoi(String s)
{ return (int)atol(s);
}
/**
Converts a string of digits (decimal, octal or hex) to a long integer @param s a string
@return the numeric value of the prefix of s representing a base 10 integer
*/
public static long atol(String s)
{ int i = 0; while (i < s.length() && Character.isWhitespace(s.charAt(i))) i++;
if (i < s.length() && s.charAt(i) == '0')
{ if (i + 1 < s.length() && (s.charAt(i + 1) == 'x' || s.charAt(i + 1) == 'X'))
return parseLong(s.substring(i + 2), 16);
else return parseLong(s, 8);
}
else return parseLong(s, 10);
} private static long parseLong(String s, int base)
{ int i = 0;
int sign = 1;
long r = 0;
while (i < s.length() && Character.isWhitespace(s.charAt(i))) i++;
if (i < s.length() && s.charAt(i) == '-') { sign = -1; i++; }
else if (i < s.length() && s.charAt(i) == '+') { i++; }
while (i < s.length())
{ char ch = s.charAt(i);
if ('0' <= ch && ch < '0' + base)
r = r * base + ch - '0';
else if ('A' <= ch && ch < 'A' + base - 10)
r = r * base + ch - 'A' + 10 ;
else if ('a' <= ch && ch < 'a' + base - 10)
r = r * base + ch - 'a' + 10 ;
else
return r * sign;
i++;
}
return r * sign;
}
/**
Converts a string of digits to a <tt>double</tt> @param s a string
*/
public static double atof(String s)
{ int i = 0;
int sign = 1;
double r = 0; // integer part
double f = 0; // fractional part
double p = 1; // exponent of fractional part
int state = 0; // 0 = int part, 1 = frac part
while (i < s.length() && Character.isWhitespace(s.charAt(i))) i++;
if (i < s.length() && s.charAt(i) == '-') { sign = -1; i++; }
else if (i < s.length() && s.charAt(i) == '+') { i++; }
while (i < s.length())
{ char ch = s.charAt(i);
if ('0' <= ch && ch <= '9')
{ if (state == 0)
r = r * 10 + ch - '0';
else if (state == 1)
{ p = p / 10;
r = r + p * (ch - '0');
}
}
else if (ch == '.')
{ if (state == 0) state = 1;
else return sign * r;
}
else if (ch == 'e' || ch == 'E')
{ long e = (int)parseLong(s.substring(i + 1), 10);
return sign * r * Math.pow(10, e);
}
else return sign * r;
i++;
}
return sign * r;
}
/**
Formats a <tt>double</tt> into a string (like sprintf in C) @param x the number to format
@return the formatted string
@exception IllegalArgumentException if bad argument
*/
public String format(double x)
{ String r;
if (precision < 0) precision = 6;
int s = 1;
if (x < 0) { x = -x; s = -1; }
if (fmt == 'f')
r = fixed_format(x);
else if (fmt == 'e' || fmt == 'E' || fmt == 'g' || fmt == 'G')
r = exp_format(x);
else throw new java.lang.IllegalArgumentException();
return pad(sign(s, r));
} /**
Formats an integer into a string (like sprintf in C) @param x the number to format
@return the formatted string
*/
public String format(int x)
{ long lx = x;
if (fmt == 'o' || fmt == 'x' || fmt == 'X')
lx &= 0xFFFFFFFFL;
return format(lx);
}
/**
Formats a long integer into a string (like sprintf in C) @param x the number to format
@return the formatted string
*/
public String format(long x)
{ String r;
int s = 0;
if (fmt == 'd' || fmt == 'i')
{ if (x < 0)
{ r = ("" + x).substring(1);
s = -1;
}
else
{ r = "" + x;
s = 1;
}
}
else if (fmt == 'o')
r = convert(x, 3, 7, "01234567");
else if (fmt == 'x')
r = convert(x, 4, 15, "0123456789abcdef");
else if (fmt == 'X')
r = convert(x, 4, 15, "0123456789ABCDEF");
else throw new java.lang.IllegalArgumentException();
return pad(sign(s, r));
}
/**
Formats a character into a string (like sprintf in C) @param x the value to format
@return the formatted string
*/
public String format(char c)
{ if (fmt != 'c')
throw new java.lang.IllegalArgumentException(); String r = "" + c;
return pad(r);
}
/**
Formats a string into a larger string (like sprintf in C) @param x the value to format
@return the formatted string
*/
public String format(String s)
{ if (fmt != 's')
throw new java.lang.IllegalArgumentException();
if (precision >= 0 && precision < s.length())
s = s.substring(0, precision);
return pad(s);
}
/**
a test stub for the format class
*/
public static void main(String[] a)
{ double x = 1.23456789012;
double y = 123;
double z = 1.2345e30;
double w = 1.02;
double u = 1.234e-5;
int d = 0xCAFE;
Format.printf("x = |%f|\n", x);
Format.printf("u = |%20f|\n", u);
Format.printf("x = |% .5f|\n", x);
Format.printf("w = |%20.5f|\n", w);
Format.printf("x = |%020.5f|\n", x);
Format.printf("x = |%+20.5f|\n", x);
Format.printf("x = |%+020.5f|\n", x);
Format.printf("x = |% 020.5f|\n", x);
Format.printf("y = |%#+20.5f|\n", y);
Format.printf("y = |%-+20.5f|\n", y);
Format.printf("z = |%20.5f|\n", z);
Format.printf("x = |%e|\n", x);
Format.printf("u = |%20e|\n", u);
Format.printf("x = |% .5e|\n", x);
Format.printf("w = |%20.5e|\n", w);
Format.printf("x = |%020.5e|\n", x);
Format.printf("x = |%+20.5e|\n", x);
Format.printf("x = |%+020.5e|\n", x);
Format.printf("x = |% 020.5e|\n", x);
Format.printf("y = |%#+20.5e|\n", y);
Format.printf("y = |%-+20.5e|\n", y);
Format.printf("x = |%g|\n", x);
Format.printf("z = |%g|\n", z);
Format.printf("w = |%g|\n", w);
Format.printf("u = |%g|\n", u);
Format.printf("y = |%.2g|\n", y);
Format.printf("y = |%#.2g|\n", y); Format.printf("d = |%d|\n", d);
Format.printf("d = |%20d|\n", d);
Format.printf("d = |%020d|\n", d);
Format.printf("d = |%+20d|\n", d);
Format.printf("d = |% 020d|\n", d);
Format.printf("d = |%-20d|\n", d);
Format.printf("d = |%20.8d|\n", d);
Format.printf("d = |%x|\n", d);
Format.printf("d = |%20X|\n", d);
Format.printf("d = |%#20x|\n", d);
Format.printf("d = |%020X|\n", d);
Format.printf("d = |%20.8x|\n", d);
Format.printf("d = |%o|\n", d);
Format.printf("d = |%020o|\n", d);
Format.printf("d = |%#20o|\n", d);
Format.printf("d = |%#020o|\n", d);
Format.printf("d = |%20.12o|\n", d);
Format.printf("s = |%-20s|\n", "Hello");
Format.printf("s = |%-20c|\n", '!'); // regression test to confirm fix of reported bugs Format.printf("|%i|\n", Long.MIN_VALUE); Format.printf("|%6.2e|\n", 0.0);
Format.printf("|%6.2g|\n", 0.0); Format.printf("|%6.2f|\n", 9.99);
Format.printf("|%6.2f|\n", 9.999); Format.printf("|%6.0f|\n", 9.999);
d = -1;
Format.printf("d = |%X|\n", d);
}
private static String repeat(char c, int n)
{ if (n <= 0) return "";
StringBuffer s = new StringBuffer(n);
for (int i = 0; i < n; i++) s.append(c);
return s.toString();
} private static String convert(long x, int n, int m, String d)
{ if (x == 0) return "0";
String r = "";
while (x != 0)
{ r = d.charAt((int)(x & m)) + r;
x = x >>> n;
}
return r;
} private String pad(String r)
{ String p = repeat(' ', width - r.length());
if (left_align) return pre + r + p + post;
else return pre + p + r + post;
}
private String sign(int s, String r)
{ String p = "";
if (s < 0) p = "-";
else if (s > 0)
{ if (show_plus) p = "+";
else if (show_space) p = " ";
}
else
{ if (fmt == 'o' && alternate && r.length() > 0 && r.charAt(0) != '0') p = "0";
else if (fmt == 'x' && alternate) p = "0x";
else if (fmt == 'X' && alternate) p = "0X";
}
int w = 0;
if (leading_zeroes)
w = width;
else if ((fmt == 'd' || fmt == 'i' || fmt == 'x' || fmt == 'X' || fmt == 'o')
&& precision > 0) w = precision;
return p + repeat('0', w - p.length() - r.length()) + r;
}
private String fixed_format(double d)
{ boolean removeTrailing
= (fmt == 'G' || fmt == 'g') && !alternate;
// remove trailing zeroes and decimal point if (d > 0x7FFFFFFFFFFFFFFFL) return exp_format(d);
if (precision == 0)
return (long)(d + 0.5) + (removeTrailing ? "" : "."); long whole = (long)d;
double fr = d - whole; // fractional part
if (fr >= 1 || fr < 0) return exp_format(d); double factor = 1;
String leading_zeroes = "";
for (int i = 1; i <= precision && factor <= 0x7FFFFFFFFFFFFFFFL; i++)
{ factor *= 10;
leading_zeroes = leading_zeroes + "0";
}
long l = (long) (factor * fr + 0.5);
if (l >= factor) { l = 0; whole++; } // CSH 10-25-97
String z = leading_zeroes + l;
z = "." + z.substring(z.length() - precision, z.length()); if (removeTrailing)
{ int t = z.length() - 1;
while (t >= 0 && z.charAt(t) == '0') t--;
if (t >= 0 && z.charAt(t) == '.') t--;
z = z.substring(0, t + 1);
} return whole + z;
} private String exp_format(double d)
{ String f = "";
int e = 0;
double dd = d;
double factor = 1;
if (d != 0)
{ while (dd > 10) { e++; factor /= 10; dd = dd / 10; }
while (dd < 1) { e--; factor *= 10; dd = dd * 10; }
}
if ((fmt == 'g' || fmt == 'G') && e >= -4 && e < precision)
return fixed_format(d);
d = d * factor;
f = f + fixed_format(d);
if (fmt == 'e' || fmt == 'g')
f = f + "e";
else
f = f + "E"; String p = "000";
if (e >= 0)
{ f = f + "+";
p = p + e;
}
else
{ f = f + "-";
p = p + (-e);
}
return f + p.substring(p.length() - 3, p.length());
}
private int width;
private int precision;
private String pre;
private String post;
private boolean leading_zeroes;
private boolean show_plus;
private boolean alternate;
private boolean show_space;
private boolean left_align;
private char fmt; // one of cdeEfgGiosxXos
}import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.text.*;
import javax.swing.event.*;
public class CustomTextFormator extends PlainDocument
{ private String strAllowChar =null;
private int intMaxLength =0;
private int intDataType=0;
private int intPricesion=0;
public static final int INTEGER_TEXT=1;
public static final int FLOAT_TEXT=2;
public static final int DATE_YEAR=3;
public static final int DATE_MONTH=4;
//--- Construct Function
public CustomTextFormator(int intMaxLength)
{ super();
this.intMaxLength = intMaxLength;
}
//----
public CustomTextFormator(int intMaxLength, String strCharList)
{ super();
this.intMaxLength = intMaxLength;
this.strAllowChar = strCharList;
}
//----
public CustomTextFormator(int intMaxLength, int intDataType)
{ super();
this.intMaxLength = intMaxLength;
this.intDataType = intDataType;
if(intDataType == this.INTEGER_TEXT)
this.strAllowChar = "-1234567890";
else if(intDataType == this.DATE_YEAR)
this.strAllowChar = "1234567890";
else if(intDataType == this.DATE_MONTH)
this.strAllowChar = "1234567890";
else if(intDataType == this.FLOAT_TEXT)
this.strAllowChar = "-1234567890.";
}
//----
public CustomTextFormator(int intMaxLength, int intDataType, int intPricesion)
{ super();
this.intMaxLength = intMaxLength;
this.intDataType = intDataType;
if(intDataType == this.INTEGER_TEXT)
this.strAllowChar = "-1234567890";
else if(intDataType == this.FLOAT_TEXT)
this.strAllowChar = "-1234567890.";
this.intPricesion = intPricesion;
}
//==== Check Function Panel ===
public void insertString(int offset, String s, AttributeSet attributeSet) throws BadLocationException
{
if (!(s == null)) {
//-- Check Length
String strLastText = super.getText(0,super.getLength());
if(this.intMaxLength>0)
{ /*if(s.length()>1)
{ if(s.getBytes().length+strLastText.getBytes().length>=(this.intMaxLength+this.intPricesion+1))
s=s.substring(0,this.intMaxLength-strLastText.getBytes().length);
}
else*/
{ int intIntegerPos = strLastText.indexOf(".");
if(intIntegerPos >=0)
{ if(intIntegerPos>this.intMaxLength)
return;
if(strLastText.getBytes().length>=(this.intMaxLength+this.intPricesion+1))
return;
}
else
{ if(strLastText.getBytes().length>=this.intMaxLength && (!s.equals(".")))
return;
}
}
}
//-- Check Char String--
if(this.strAllowChar instanceof String)
{ String strCheckChar=null;
for(int i=0;i<s.length();i++)
{ strCheckChar=s.substring(i,i+1);
if(this.strAllowChar.indexOf(strCheckChar)<0)
return;
}
}
//---- Check Signed Position
int intSignedPos = s.trim().indexOf("-");
if(intSignedPos >0 && offset>0)
return;
//----
if(this.intDataType == this.DATE_MONTH)
{ if(strLastText.length()>0)
{ if(strLastText.compareTo("1")>0)
return;
else if(strLastText.compareTo("1")==0 && s.compareTo("2")>0)
return;
else if(strLastText.compareTo("0")==0 && s.compareTo("0")==0)
return;
}
}
//--- Check Precision -
else if(this.intPricesion >0)
{ int intDotPos=strLastText.lastIndexOf(".");
if(s.indexOf(".")>=0)
{ if(intDotPos >0)
return; //--- 已有点号
else //--- 插入点号
{ int intCurrentDotPos = s.indexOf(".");
if((s.length()-intCurrentDotPos-1) + (strLastText.length()-offset) > this.intPricesion)
return;
} }
if(intDotPos>=0 && (strLastText.trim().length()-intDotPos>this.intPricesion)
&& offset>intDotPos)
return;
}
}
super.insertString(offset,s,attributeSet);
}
//============================
}示例如下:
JTextField.setDocument(new CustomTextFormator(max_length, type));