Java基础知识强化35:String类之String的其他功能
1. String类的其他功能:
(1)替换功能:
String replace(char old, char new) String replace(String old,String new)
(2)去除字符串两端的空格
String trim()
(3)按照字典顺序比较两个字符串
int compareTo(String str) int compareToIgnoreCase(String str)
2. 案例演示:
1 package cn.itcast_06; 2 3 /* 4 * String类的其他功能: 5 * 6 * 替换功能: 7 * String replace(char old,char new) 8 * String replace(String old,String new) 9 * 10 * 去除字符串两空格 11 * String trim() 12 * 13 * 按字典顺序比较两个字符串 14 * int compareTo(String str) 15 * int compareToIgnoreCase(String str) 16 */ 17 public class StringDemo { 18 public static void main(String[] args) { 19 // 替换功能 20 String s1 = "helloworld"; 21 String s2 = s1.replace('l', 'k'); 22 String s3 = s1.replace("owo", "ak47"); 23 System.out.println("s1:" + s1); 24 System.out.println("s2:" + s2); 25 System.out.println("s3:" + s3); 26 System.out.println("---------------"); 27 28 // 去除字符串两空格 29 String s4 = " hello world "; 30 String s5 = s4.trim(); 31 System.out.println("s4:" + s4 + "---"); 32 System.out.println("s5:" + s5 + "---"); 33 34 // 按字典顺序比较两个字符串 35 String s6 = "hello"; 36 String s7 = "hello"; 37 String s8 = "abc"; 38 String s9 = "xyz"; 39 System.out.println(s6.compareTo(s7));// 0 40 System.out.println(s6.compareTo(s8));// 7 41 System.out.println(s6.compareTo(s9));// -16 42 } 43 }
运行效果如下: