String类的其他功能

package niu.cheng5;


/*
 * String类的其他功能
 * 替换
 * public String replace(char opldChar, char newChar)替换单个字符
 * public String replaceAll(String regex, String replacement)替换字符串
 * 去除前后两空格
 * public String trim()
 * 按字典顺序比较两个字符
 * public int compareTo(String anotherString)
 * public int compareToIgnoreCase(String str)（不考虑大小写）
 * */
public class StringDemo1 {
public static void main(String[] args) {
//替换功能
//public String replace(char opldChar, char newChar)替换单个字符
String s1="helloworld";
String s2=s1.replace('o','q');
System.out.println("s1:"+s1);//s1:helloworld
System.out.println("s2:"+s2);//s2:hellqwqrld
System.out.println("-------------------");

//public String replaceAll(String regex, String replacement)替换字符串
String s3=s1.replace("owo","Ak47");
System.out.println("s1:"+s1);//s1:helloworld
System.out.println("s3:"+s3);//s3:hellAk47rld
System.out.println("-------------------");

//去除前后空格public String trim()
String s4=" hello world ";
String s5=s4.trim();
System.out.println("s4:"+s4);//s4: hello world 
System.out.println("s5:"+s5);//s5:hello world
System.out.println("-------------------");

//按字典顺序比较两个字符
//public int compareTo(String anotherString)(区分大小写)
String a="hehe";
String a1="hehe";
String a2="Hehe";
String a3="Aehe";
String a4="behe";
System.out.println(a.compareTo(a1));//h-h 0
System.out.println(a.compareTo(a2));//h-H 32
System.out.println(a.compareTo(a3));//h-A 39
System.out.println(a.compareTo(a4));//h-b 6
System.out.println("-------------------");

//public int compareToIgnoreCase(String str)（不考虑大小写）
System.out.println(a.compareToIgnoreCase(a1));//h-h 0
System.out.println(a.compareToIgnoreCase(a2));//h-H 0
System.out.println(a.compareToIgnoreCase(a3));//h-A 7
System.out.println(a.compareToIgnoreCase(a4));//h-b 6
}
}