package com.demo;
import java.util.Scanner;

public class Test4 {


    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("輸入3科成績：java，android，sql");
        int java = scanner.nextInt();
        int android = scanner.nextInt();
        int
 
 sql = scanner.nextInt();
        int maxScore = java;
        if(maxScore < android){
            maxScore = android;
        }
        if (maxScore < sql){
            maxScore = sql;
        }
        System.out.println("最大成績為："+maxScore);

思路在於定義一個變數maxScore，經過比較，總是將最大值儲存在該變數中，最後輸出該變數即可
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