判斷一個數是正數還是負數還是0、判斷最大值

package com.guoba.testhello;

import java.util.Scanner;

public class ZuiDaZhi {
    public static void main(String[] args) {
        System.out.println("1.判斷一個數是正數還是負數還是0");
        System.out.println("請輸入一個數：");
        Scanner scanner = new Scanner(System.in);
        int i = scanner.nextInt();
        if (i > 0){
                System.out.println("您輸入的數是正數");
        }else if (i == 0){
                System.out.println("您輸入的數是零");
        }else if (i < 0){
                System.out.println("您輸入的數是負數");
        }


        System.out.println("2.判斷最大值");
        System.out.println("請輸入三個數：");
        int a = scanner.nextInt();
        int b = scanner.nextInt();
        int c = scanner.nextInt();
        System.out.println("方法一");
        //判斷最大值
        if (a > b) {
            if (a > c) {
                System.out.println("您輸入的最大值是" + a);
            } else {
                System.out.println("您輸入的最大值是" + c);
            }
        } else {
            if (b > c) {
                System.out.println("您輸入的最大值是" + b);
            } else {
                System.out.println("您輸入的最大值是" + c);
            }
        }

        System.out.println("方法二");
        //方法二
        int max = ((a > b) ? ((a > c) ? a: c):((b > c) ? b : c));
        System.out.println("您輸入的最大值是"+max);

        System.out.println("方法三");
        System.out.println(((a>b?a:b)>c)?(a>b?a:b):c);

    }
}