字符串比较（java）：compareTo()、compareToIgnoreCase()

//package CompareString;

import java.util.Scanner;



public class CompareString {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.println("输入第一个字符串:");
        String s1 = sc.nextLine();
        System.out.println("输入第二个字符串:");
        String s2 = sc.nextLine();

        System.out.println("");
        //区分大小写比较
        if(s1.compareTo(s2)==0)
            System.out.println("区分大小写比较相等");
        else if(s1.compareTo(s2) > 0)
            System.out.println("区分大小写比较第一个字符串较大");
        else
            System.out.println("区分大小写比较第二个字符串较大");

        System.out.println("");
        //不区分大小写
        if(s1.compareToIgnoreCase(s2)==0)
            System.out.println("不区分大小写比较相等");
        else if(s1.compareToIgnoreCase(s2)> 0)
            System.out.println("不区分大小写第一个字符串大");
        else
            System.out.println("不区分大小写第二个字符串大");

        int n = 0;
        int num = s1.length();
        if (num > s2.length())
            num = s2.length();
        for (int i = 0; i < num; i++) {
            if (s1.charAt(i) == s2.charAt(i)) {
                n++;
            }
        }
        System.out.println("n两个字符串依次比较共有 " + n + " 个字符相等");
    }
}