Java keyboard IO.

HelloWorld.java

import java.io.*;

class HelloWorld
{
	public static void main(String args[])
	{
		InputStreamReader sin = new InputStreamReader(System.in);
		BufferedReader br = new BufferedReader(sin);
		System.out.println("Type your name: ");
		try{ 
			String name = br.readLine();
			System.out.println("Type num: ");
			String nums = br.readLine();
			int num = Integer.parseInt(nums);
			for (int i=0; i<num; i++) {
				System.out.println("Hello " + name);
			}
		} catch (Exception e) {
			System.out.println(e.toString());
		} 	
	}
}

TestScanner.java

import java.io.*;
import java.util.Scanner;

public class TestScanner {
	public static void main(String [] args) {
		Scanner sc = new Scanner(System.in);
		System.out.println("请输入你的姓名：");
		String name = sc.nextLine();
		System.out.println("请输入你的年龄：");
		int age = sc.nextInt();
		System.out.println("请输入你的工资：");
		float salary = sc.nextFloat();
		System.out.println("你的信息如下：");
		System.out.println("姓名："+name+"\n"+"年龄："+age+"\n"+"工资："+salary);
    }
}