String的用法——其他功能

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 {

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

}

}