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+---
+abbrlink: 3073696125
+author: yingyu5658
+categories:
+- 往昔
+cid: 90
+cover: images\2024\12\2743265221.jpg
+customSummary: null
+date: "2024-11-30 18:51:07"
+layout: post
+mathjax: auto
+noThumbInfoEmoji: null
+noThumbInfoStyle: default
+outdatedNotice: false
+parseWay: auto
+reprint: standard
+slug: 90
+status: publish
+tags:
+- Java
+thumb: null
+thumbChoice: default
+thumbDesc: null
+thumbSmall: null
+thumbStyle: default
+title: Java小程序之两数计算器
+---
+
+
+这个案例是我练习方法的使用时做的，应该能有更好的方式实现这个功能。
+代码如下
+```java
+
+import org.w3c.dom.ls.LSOutput;
+
+import java.util.Scanner;
+
+public class Basic {
+    public static void main(String[] args) {
+        for (; ; ) {
+
+
+            System.out.println("欢迎使用！");
+            System.out.println("按键1 2 3 4分别为加 减 乘 除，输入后请回车");
+            Scanner startSc = new Scanner(System.in);
+            int selectNumber = startSc.nextInt();
+            if(selectNumber >4) {
+                System.out.println("请输入正确的数字以选择！");
+            }
+            //以下为加法
+            if (selectNumber == 1) {
+                System.out.println("请输入您要计算的第一个数字");
+                Scanner jiafaSc = new Scanner(System.in);
+                int jiafa1 = jiafaSc.nextInt();
+                System.out.println("请输入您要计算的第二个数字");
+                int jiafa2 = jiafaSc.nextInt();
+                jiafa(jiafa1, jiafa2);
+            }
+            //以下为减法
+            if (selectNumber == 2) {
+                System.out.println("请输入您要计算的第一个数字");
+                Scanner jianfaSc = new Scanner(System.in);
+                int jianfa1 = jianfaSc.nextInt();
+                System.out.println("请输入您要计算的第二个数字");
+                int jianfa2 = jianfaSc.nextInt();
+                jianfa(jianfa1, jianfa2);
+            }
+            //以下为乘法
+            if (selectNumber == 3) {
+                System.out.println("请输入您要计算的第一个数字");
+                Scanner chengfaSc = new Scanner(System.in);
+                int chengfa1 = chengfaSc.nextInt();
+                System.out.println("请输入您要计算的第二个数字");
+                int chengfa2 = chengfaSc.nextInt();
+                chengfa(chengfa1, chengfa2);
+            }
+            if (selectNumber == 4) {
+                System.out.println("请输入您要计算的第一个数字");
+                Scanner chufaSc = new Scanner(System.in);
+                int chufa1 = chufaSc.nextInt();
+                System.out.println("请输入您要计算的第二个数字");
+                int chufa2 = chufaSc.nextInt();
+                chufa(chufa1, chufa2);
+            }
+            System.out.println("-----------------------------------------");
+        }
+    }
+    //加减乘除各项功能的方法，上面直接调用
+    public static int jiafa(int a, int b) {
+        int jieguo = a + b;
+        System.out.println(jieguo);
+        return a + b;
+    }
+
+    public static int jianfa(int a, int b) {
+        int jieguo = a - b;
+        System.out.println(jieguo);
+        return a - b;
+    }
+
+    public static int chengfa(int a, int b) {
+        int jieguo = a * b;
+        System.out.println(jieguo);
+        return a * b;
+    }
+
+    public static int chufa(int a, int b) {
+        int jieguo = a / b;
+        System.out.println(jieguo);
+        return a / b;
+    }
+}