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📜  Java字符串之-replace()

📅  最后修改于: 2020-09-26 05:58:46             🧑  作者: Mango

Java String replace()

Java 字符串 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;
}

Signature(签名)

java 字符串有两种替换方法。

public String replace(char oldChar, char newChar)
and
public String replace(CharSequence target, CharSequence replacement)

从JDK 1.5开始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

替换：字符的替换顺序

返回值或类型

替换字符串

Java String replace(char old，char new)方法示例

public class ReplaceExample1{
public static void main(String args[]){
String s1="javatpoint is a very good website";
String replaceString=s1.replace('a','e');//replaces all occurrences of 'a' to 'e'
System.out.println(replaceString);
}}

"jevetpoint is e very good website

Java String replace(CharSequence目标，CharSequence替换)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");//replaces all occurrences of "is" to "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"); // Replace 'h' with 's'
System.out.println(rs);
rs = rs.replace("s","h"); // Replace 's' with 'h'
System.out.println(rs);
}
}
oooooo-ssss-oooooo
oooooo-hhhh-oooooo