输入和输出

scanner

Scanner in = new Scanner(System.in);
String name = in.next()

我们来看几段代码

public static void main(String[] args) {
		Scanner inScanner = new Scanner(System.in);
		System.out.println("what is your name?");
		String name = inScanner.nextLine();
		
		Scanner inage = new Scanner(System.in);
		System.out.println("what is age?");
		int  age = inage.nextInt();
		
		System.out.println(age + name);
		
	}

public static void main(String[] args) {
		Scanner inlength = new Scanner(System.in);
		int length = inlength.nextInt();
		int[] arr = new int[length];
		
		for (int i = 0; i < arr.length; i++) {
			Scanner inScanner = new Scanner(System.in);
			arr[i] = inScanner.nextInt();
		}
		
		System.out.println(Arrays.toString(arr));
}

public class GuessNumber {
	public static void main(String[] args) {
		//1.通过Random类中方法nextInt（），生成一个1-100之间的随机数
		int randomNumber = new Random().nextInt(100);
		System.out.println("随机数已生成！");
		//2.输入猜的数字
		System.out.println("----请输入您猜的数字：----");
		Scanner sc = new Scanner(System.in);
		int enterNumber = sc.nextInt();
		//3.通过while循环，进行猜数字对错判断
		//猜对，跳出循环，游戏结束
		while(enterNumber != randomNumber){
			//猜错了，根据结果，给出提示，接着猜数字，游戏继续
			if(enterNumber>randomNumber) { 
				//如果猜大了，打印sorry，您猜大了!继续下一次循环
				System.out.println("sorry，您猜大了!继续下一次循环");
			}else {
				//如果猜小了，打印sorry，您猜小了!继续下一次循环
				System.out.println("sorry，您猜小了!继续下一次循环");
			}
			//输入猜的数字
			System.out.println("----请输入您猜的数字：----");
			enterNumber = sc.nextInt();
		}
		System.out.println("恭喜您，答对了！");
	}
}