String 1 = "";
String = "I'm a boy";
while(.indexOf("'") > 0)
{
1 = 1 + .substring(0, .indexOf("'"));
1 = 1 + "'";
= .substring(.indexOf("'") , .length());
}
1 = 1 + ;
System.out.println(1);
String = "I'm a boy";
while(.indexOf("'") > 0)
{
1 = 1 + .substring(0, .indexOf("'"));
1 = 1 + "'";
= .substring(.indexOf("'") , .length());
}
1 = 1 + ;
System.out.println(1);
解决方案 »
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= .replaceAll("'","''");
字串的特性就是不能往里面插入字符的(至少jdk1.3或之前)。
String = "'I'm ' a 'boy'";
while(.indexOf("'") > -1)
{
1 = 1 + .substring(0, .indexOf("'"));
1 = 1 + "''";
= .substring(.indexOf("'")+1 , .length());
}
1 = 1 + ;
System.out.println(1);如果你输入:
String = "'I'm ' a 'boy'";结果:
''I''m '' a ''boy''
但提供了replaceAll(String, String) 的方法返回一个new String
final String STR1 = "''";
StringBuffer sb = new StringBuffer();
String = "I am a boy";
int start = 0, end = .length();
int index = 0;
while ((index = .indexOf(CH1, start)) != -1) {
sb.append(.substring(start, index)).append(STR1);
start = index + 1;
}
sb.append(.substring(start, end));
System.out.println(sb.toString());
final String STR1 = "''";
StringBuffer sb = new StringBuffer();
String = "I am a boy";
int start = 0, end = .length();
int index = 0;
while ((index = .indexOf(CH1, start)) != -1) {
sb.append(.substring(start, index)).append(STR1);
start = index + 1;
}
sb.append(.substring(start, end));
System.out.println(sb.toString());
public static void main(String[] args) {
String = "'I'm ' a 'boy'";
String 1 = .replaceAll("'", "''");
System.out.println();
System.out.println(1);
}
}使用jdk1.4在jb7下编译运行结果为:D:\jdk1.4\bin\javaw -classpath "C:\pdm\pdm\classes;C:\pdm\LabelScript.jar;C:\pdm\mx2002.jar;D:\LabelScript\bin\xerces.jar;D:\LabelScript\bin\jdom.jar;C:\pdm\JTurbo.jar;D:\JBuilder7\tomcat3.2.3\lib\webserver.jar;D:\JBuilder7\tomcat3.2.3\lib\servlet.jar;D:\JBuilder7\tomcat3.2.3\lib\parser.jar;D:\JBuilder7\tomcat3.2.3\lib\jaxp.jar;D:\JBuilder7\tomcat3.2.3\lib\jasper.jar;D:\JBuilder7\jakarta-tomcat-4.0.3\common\lib\servlet.jar;D:\jdk1.4\demo\jfc\Java2D\Java2Demo.jar;D:\jdk1.4\demo\plugin\jfc\Java2D\Java2Demo.jar;D:\jdk1.4\jre\lib\charsets.jar;D:\jdk1.4\jre\lib\ext\dnsns.jar;D:\jdk1.4\jre\lib\ext\ldapsec.jar;D:\jdk1.4\jre\lib\ext\localedata.jar;D:\jdk1.4\jre\lib\ext\sunjce_provider.jar;D:\jdk1.4\jre\lib\jaws.jar;D:\jdk1.4\jre\lib\jce.jar;D:\jdk1.4\jre\lib\jsse.jar;D:\jdk1.4\jre\lib\rt.jar;D:\jdk1.4\jre\lib\sunrsasign.jar;D:\jdk1.4\lib\dt.jar;D:\jdk1.4\lib\htmlconverter.jar;D:\jdk1.4\lib\tools.jar" pdm.test
'I'm ' a 'boy'''I''m '' a ''boy''
jery_lee(U2-G2000) 和 caoze(大漠孤烟) 我就各给10分吧。