1、replace()方法
public static void main(String[] args){
String str = "hello world, hello java";
str = str.replace("h","H");
System.out.println(str);
}
//输出：Hello world, Hello java
2、replaceFirst()方法
public static void main(String[] args){
String str = "hello world, hello java";
str = str.replaceFirst("hello","Hi");
System.out.println(str);
}
//输出：Hi world, hello java
3、replaceAll()方法
public static void main(String[] args){
String str = "hello world, hello java";
str = str.replaceAll("hello","Hi");
System.out.println(str);
}
//输出：Hi world, Hi java
4、扩展：将字符串 time:[* TO ] 中第二个替换为 test
//将字符串 time:[* TO *] 中第二个*替换为 test
public static void main(String[] args){
String test = "time:[* TO *TO]";
String result1 = test.replaceAll("(\\*)(.*?)(\\1)(.*?)", "$1$2test$4");
System.out.println("原字符串：" + test);
System.out.println("替换后：" + result1);
}
//原字符串：time:[* TO *TO]
//替换后：time:[* TO testTO]
