String的用法——其他功能

佚名 6年前 (2019-05-09) 随笔 790人围观抢沙发百度已收录

package cn.itcast_06;
/*

String类的其他功能：
```
 替换功能：
```
```
     String replace(char old,char new)
```

     String replace(String old,String new)

```
 去除字符串两空格：
```
```
     String trim()
```

 按字典顺序比较两个字符串（大小）

     int compareTo(String str)//区分大小写

     int compareToIgnoreCase(String str)//不区分大小写

public class StringDemo {

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public static void main(String[] args) {
    // TODO Auto-generated method stub
    //替换功能
    String s1 = "helloworld";
    String s2 = s1.replace('l', 'k');
    String s3 = s1.replace("ll", "kk");
    String s4 = s1.replace("ll", "kkkkk");
    
    System.out.println("s1:" + s1);//helloworld
    System.out.println("s2:" + s2);//hekkoworkd
    System.out.println("s3:" + s3);//hekkoworld
    System.out.println("s4:" + s4);//hekkkkkoworld
    
    //去除字符串两端空格：String trim()
    String s5 = "         hello     world                  ";
    String s6 = s5.trim();
    System.out.println("s5:" + s5 + "---");
    System.out.println("s6:" + s6 + "---");
    
    //按字典顺序比较两个字符串（大小）
    String s7 = "hello";
    String s8 = "hfllo";
    String s9 = "gbc";
    String s10 = "xyz";
    System.out.println(s7.compareTo(s7));//0
    System.out.println(s7.compareTo(s8));//-1
    System.out.println(s7.compareTo(s9));//1
    System.out.println(s7.compareTo(s10));//-16
    
}

}