Java-字符转比较

实用的字符串比较方法

 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);

     }
 }