How to get data from keyboard in java

import java.util.Scanner;// 导包， 找到Scanner的位置
 
public class TestScore{
 
       public static void main(String [] args){
 
               //Scanner  ，描扫仪
 
               //【1】创建Scanner对象,  System.in标准的输入设备，键盘
 
                Scanner input=new Scanner(System.in); //input是描扫仪的名称，自己起，变量的命名规则
 
               //【2】给用户友好提示   System.out标准的输出设备，显示器
 
               System.out.print("请输入java课程的分数:");                
 
               //声明变量并赋值
 
               int javaScore= input.nextInt();    //从键盘录入一个整数赋值给int类型的变量 javaScore
             
               System.out.print("请输入sql课程的分数:");
 
               int sqlScore=input.nextInt();
                
               System.out.print("请输入stb课程的分数:");
 
               int stbScore=input.nextInt();
                 
               int  diffen;  //声明变量，用于存储分数差
 
               double avg;// 声明变量，用于存储平均分
 
               //给分数差及平均分赋值 
               diffen=javaScore-sqlScore;   //赋值是从右到左
                avg=(javaScore+sqlScore+stbScore)/3; 
               //avg=(javaScore+sqlScore+stbScore)/3.0; 
               System.out.println("-------------------------------"); 
               System.out.println("java\tsql\tstb");
               System.out.println(javaScore+"\t"+sqlScore+"\t"+stbScore);
               System.out.println("-------------------------------");
               System.out.println("java与sql的差是:"+diffen);
               System.out.println("三门课程的平均分为:"+avg);                                  
 
       }
 
}

import java.util.Scanner;
public class HelloWorld{
	public static void main(String [] args ){
		Scanner input=new Scanner(System.in);
		System.out.print("请输入java的成绩");
		int javaScore=input.nextInt();
		System.out.print("请输入python成绩");
		int pythonScore=input.nextInt();
		System.out.println("请输入C语言的成绩");
		int cScore=input.nextInt();
		int avg=(javaScore+pythonScore+cScore)/3;
		int diffen;
		diffen=javaScore-pythonScore;
		System.out.println("各门功课的成绩为：\t"+"javaScore \t"+"pythonScore\t"+"cScore");
		System.out.println("各门功课的成绩为：\t"+javaScore+"\t"+pythonScore+"\t"+cScore);
		System.out.println("java和python的成绩差为："+diffen);
	}
}