package com.tj;

 public class MyClass implements Cloneable {

     public static void main(String[] args) {

         String s1 = "a";

         String s2 = "A";

         String s3 = "B";

         boolean b = s1.equals(s2);

         System.out.println(b);

         // 忽略大小写

         b = s1.equalsIgnoreCase(s2);

         System.out.println(b);

         //比较ASCII值

         int i = s1.compareTo(s2);

         System.out.println(i);

         if (i < 0) {

             System.out.println("s1在s2之前");

         } else if (i > 0) {

             System.out.println("s1在s2之后");

         } else {

             System.out.println("s1等于s2");

         }

         //忽略大小写比较ASCII值

         i = s1.compareToIgnoreCase(s3);

         System.out.println(i);

         if (i < 0) {

             System.out.println("s1在s3之前");

         } else if (i > 0) {

             System.out.println("s1在s3之后");

         } else {

             System.out.println("s1等于s3");

         }

         //一个 String 也可以和 StringBuffer 做比较

         StringBuffer sbuf = new StringBuffer("a");

         b = s1.contentEquals(sbuf);

         System.out.println(b);

     }

 }