Java课后例题第2章and第4章

最新推荐文章于 2025-01-07 21:15:50 发布

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最新推荐文章于 2025-01-07 21:15:50 发布

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本文链接：https://blog.youkuaiyun.com/m0_53255923/article/details/118762520

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这个系列包含多个Java编程的基础示例，如输出班级人数、检查命令行参数数量、实现成绩评分系统以及使用switch语句。这些示例涵盖了基本输入输出、条件判断以及等级评分的逻辑处理。

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2-1

public class Ex2_1_Classmate {

public static void main(String args[])

{

int num;

num=30;

System.out.println("我们班有"+num+"位同学！");

}

2-2

public class Ex_2_2numberfoundcase {

public static void main (String[] args) {

if (args.length!=2) {System.out.println("请输入两个文件名！！！");

}

else {String infile =args[0];

String outfile =args[1];

}

4-1

import java.util.Scanner;

public class Ex4_1_testIF {

public static void main(String[] args) {

Scanner sc =new Scanner (System.in);

System.out.print("请输入成绩：");

int score =sc.nextInt();

if(score>=0&&score<=100) {

System.out.println("成绩："+score);

}

sc.close();

}

4-2

import java.util.Scanner;

public class EX4_2_testIFEles {

public static void main(String[] args) {

Scanner sc=new Scanner(System.in);

System.out.print("请输入成绩：");

int score=sc.nextInt();

if(score>=0&&score<=100) {

System.out.println("成绩："+score);

}

else {

System.out.println("输入的成绩应该在0~100之间！");

}

sc.close();

}

4-3

import java.util.Scanner;

public class EX4_3_testIFEles {

public static void main(String[] args) {

Scanner sc =new Scanner(System.in);

System.out.print("请输入成绩：");

int score =sc.nextInt();

char grade;

if (score>=90) {

grade='A';

}

else if (score>=80) {

grade='B';

}

else if(score>=70) {

grade='C';

}

else if(score>=60) {

grade='D';

}

else {

grade='F';

}

System.out.println("成绩的等级是："+grade);

sc.close();

}

4-4

public class EX4_4_testSwitch {

public static void main(String[] args) {

int random=1+(int)(Math.random()*4);

switch(random) {

case 1:

System.out.println("I feel fine");

break;

case 2:

System.out.println("I've been better");

break;

case 3:

System.out.println("I feel horrible");

break;

case 4:

System.out.println("I feel terrific");

}