public class Change {
public static void main(String[] args) {
public String str = "abc2AF9+-=";
//public void Change() {
//str = "abc2AF9+-="
//}
StringBuffer sb = new StringBuffer();
for(int i = 0;i<length();i++) {
char ch = str.length(i);
if(Character.isDigit(ch)) {
continue;
}
if (Character.isLowerCase(ch) ) {
sb.append(Character.toUpperCase(ch));
}
if(Character.isUpperCase(ch)) {
sb.append(Character.toLowerCase(ch));
}else {
ch = "*";
}
}
System.out.println(str);
System.out.println(ch); }
}
public static void main(String[] args) {
public String str = "abc2AF9+-=";
//public void Change() {
//str = "abc2AF9+-="
//}
StringBuffer sb = new StringBuffer();
for(int i = 0;i<length();i++) {
char ch = str.length(i);
if(Character.isDigit(ch)) {
continue;
}
if (Character.isLowerCase(ch) ) {
sb.append(Character.toUpperCase(ch));
}
if(Character.isUpperCase(ch)) {
sb.append(Character.toLowerCase(ch));
}else {
ch = "*";
}
}
System.out.println(str);
System.out.println(ch); }
}
public static void main(String[] args) { String str = "abc2AF9+-=";
// public void Change() {
// str = "abc2AF9+-="
// }
StringBuffer sb = new StringBuffer(); for (int i = 0; i < str.length(); i++) {
char ch = str.charAt(i);
if (Character.isDigit(ch)) {
sb.append(Character.toUpperCase(ch));
} else if (Character.isLowerCase(ch)) {
sb.append(Character.toUpperCase(ch)); } else if (Character.isUpperCase(ch)) {
sb.append(Character.toLowerCase(ch)); } else {
sb.append("*"); } }
System.out.println(str);
System.out.println(sb); }
}这样就OK了
String str = "abc2AF9+-=";
StringBuilder sb = new StringBuilder(); for (char ch : str.toCharArray())
sb.append((ch >= '0' && ch <= '9') ? ch
: (ch >= 'A' && ch <= 'Z') ? (char) (ch + 0x20)
: (ch >= 'a' && ch <= 'z') ? (char) (ch - 0x20) : "*"); System.out.println(str);
System.out.println(sb);
}
够简洁 建议你加括号 你这样写对一个新手来说不好看 还不如你弄个switch了
错了 是if else
public static void main(String[] args) {
String str = "abc2AF9+-=";
//public void Change() {
//str = "abc2AF9+-="
//}
StringBuffer sb = new StringBuffer(); for(int i = 0;i<str.length();i++) {
char ch = str.charAt(i);
if(Character.isDigit(ch)) {
sb.append(ch);
continue;
}else
if (Character.isLowerCase(ch) ) {
sb.append(Character.toUpperCase(ch)); } else
if(Character.isUpperCase(ch)) {
sb.append(Character.toLowerCase(ch)); }else {
sb.append("*");
}
}
System.out.println(str);
System.out.println(sb); }
}
// public void Change() {
// str = "abc2AF9+-="
// }
StringBuffer sb = new StringBuffer(); for (int i = 0; i < str.length(); i++) {
char ch = str.charAt(i);
if (Character.isDigit(ch)) {
continue;
}
else if (Character.isLowerCase(ch)) {
sb.append(Character.toUpperCase(ch)); }
else if (Character.isUpperCase(ch)) {
sb.append(Character.toLowerCase(ch)); } else {
//
}
}
System.out.println(str);
System.out.println(sb);
}
}
public String autoChange(String source) {
if (source == null || source.length() == 0)
return source; char[] charSet = source.toCharArray();
int dlt = 'a' - 'A';
//change every char
for (int i = 0, count = charSet.length; i < count; i++) {
if (charSet[i] >= 'a' && charSet[i] <= 'z') {
charSet[i] -= dlt;
} else if (charSet[i] >= 'A' && charSet[i] <= 'Z') {
charSet[i] += dlt;
}
}
return String.valueOf(charSet);
}
这样也行吧
if (source == null || source.length() == 0)
return source; char[] charSet = source.toCharArray(); int dlt = 'a' - 'A'; //change every char
for (int i = 0, count = charSet.length; i < count; i++) {
if (charSet[i] >= 'a' && charSet[i] <= 'z') {
charSet[i] -= dlt;
} else if (charSet[i] >= 'A' && charSet[i] <= 'Z') {
charSet[i] += dlt;
} else if (charSet[i] >= '0' && charSet[i] <= '9') {
} else {
charSet[i] = '*';
}
}
return String.valueOf(charSet);
}
/**
* 小写变大写,大写变小写,数字不变,其他的变*号
* @author jileniao.net
* @version 1.1
*/
public class Change { public static void main(String[] args) { String str = "abc2AF9+-=";
StringBuffer sb = new StringBuffer();
char ch;
for(int i = 0; i < str.length(); i++) {
ch = str.charAt(i);
if(Character.isDigit(ch)) {
// 数字
sb.append(Character.toUpperCase(ch));
} else if (Character.isLowerCase(ch) ) {
// 小写转大写
sb.append(Character.toUpperCase(ch));
} else if(Character.isUpperCase(ch)) {
// 大学转小写
sb.append(Character.toLowerCase(ch));
} else {
// 其他转*
sb.append(Character.toLowerCase('*'));
}
}
// 变换前输出
System.out.println(str);
// 变换后输出
System.out.println(sb);
}
}