java replace字符替换函数的使用方法
replace(char oldChar, char newChar)
public class MainClass
{
public static void main( String args[] )
{
String s1 = new String( "hello" );
String s2 = new String( "GOODBYE" );
String s3 = new String( " spaces " );System.out.printf( "s1 = %sns2 = %sns3 = %snn", s1, s2, s3 );
// test method replace
System.out.printf("Replace 'l' with 'L' in s1: %snn", s1.replace( 'l', 'L' ) );} // end main
}
结果
s1 = hello
s2 = GOODBYE
s3 = spaces
Replace 'l' with 'L' in s1: heLLo
将空格换成 /
public class MainClass {
public static void main(String[] arg) {
String text = "To be or not to be, that is the question.";
String newText = text.replace(' ', '/'); // Modify the string text
System.out.println(newText);
}}
结果
To/be/or/not/to/be,/that/is/the/question.
有朋友自己写了一个replace函数
// 替换字符串函数
// String strSource - 源字符串
// String strFrom - 要替换的子串
// String strTo - 替换为的字符串
public static String replace(String strSource, String strFrom, String strTo)
{
// 如果要替换的子串为空,则直接返回源串
if(strFrom == null || strFrom.equals(""))
return strSource;
String strDest = "";
// 要替换的子串长度
int intFromLen = strFrom.length();
int intPos;
// 循环替换字符串
while((intPos = strSource.indexOf(strFrom)) != -1)
{
// 获取匹配字符串的左边子串
strDest = strDest + strSource.substring(0,intPos);
// 加上替换后的子串
strDest = strDest + strTo;
// 修改源串为匹配子串后的子串
strSource = strSource.substring(intPos + intFromLen);
}
// 加上没有匹配的子串
strDest = strDest + strSource;
// 返回
return strDest;
}