Java String replace()
java String replace()方法返回一个字符串，该字符串将所有旧的char或CharSequence替换为新的char或CharSequence。
从JDK 1.5开始，引入了新的replace()方法，使您可以替换一系列char值。
内部实现
public String replace(char oldChar, char newChar) {
if (oldChar != newChar) {
int len = value.length;
int i = -1;
char[] val = value;
/*
avoid getfield opcode
*/
while (++i < len) {
if (val[i] == oldChar) {
break;
}
}
if (i < len) {
char buf[] = new char[len];
for (int j = 0; j < i; j++) {
buf[j] = val[j];
}
while (i < len) {
char c = val[i];
buf[i] = (c == oldChar) ? newChar : c;
i++;
}
return new String(buf, true);
}
}
return this;
}
签名
java字符串中有两种替换方法。
public String replace(char oldChar, char newChar)
和
public String replace(CharSequence target, CharSequence replacement)
自JDK 1.5起添加了第二种替换方法。
参数
oldChar : 旧字符
newChar : 新字符
target: 目标字符序列
replacement: 字符替换序列
返回
替换的字符串
Java replace(oldChar，newChar)方法示例
public class ReplaceExample1{
public static void main(String args[]){
String s1="lidihuo is a very good website";
String replaceString=s1.replace('i','e');
System.out.println(replaceString);
}
}
ledehuo es a very good websete
String replace(CharSequence target, CharSequence replacement)方法示例
public class ReplaceExample2{
public static void main(String args[]){
String s1="my name is khan my name is java";
String replaceString=s1.replace("is","was");
System.out.println(replaceString);
}
}
my name was khan my name was java
Java String replace()方法示例3
public class ReplaceExample3 {
public static void main(String[] args) {
String str = "oooooo-hhhh-oooooo";
String rs = str.replace("h","s");
System.out.println(rs);
rs = rs.replace("s","h");
System.out.println(rs);
}
}
oooooo-ssss-oooooooooooo-hhhh-oooooo
