ASCII表和Java中CompareTo()方法

Java中CompareTo()方法：

String 字符串用compareTo方法从第一位开始比较, 如果遇到不同的字符,则马上返回这两个字符的ascii值差值.返回值是int类型

Java中CompareTo()方法的详细介绍

package MapTest;

public class Map6 {
    public static void main(String[] args) {
        String a = "a";
        String b = "b";
        String c = "a";
        String e = "e";
        String abc = "abc";

        int i = a.compareTo(b);//-1
        System.out.println("i = " + i);
        int i1 = b.compareTo(a);//1
        System.out.println("i1 = " + i1);
        int i2 = c.compareTo(a);//0
        System.out.println("i2 = " + i2);
        int i3 = e.compareTo(b);//1
        System.out.println("i3 = " + i3);
        int i4 = e.compareTo(abc);//101-97 = 4
        System.out.println("i4 = " + i4);
        int i5 = abc.compareTo(e);//97-101 = -4
        System.out.println("i5 = " + i5);
    }
}