Java_案例实例1.简单的人机交互

心已赠人 2023-03-01 11:46 60阅读 0赞

运行效果截图：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ2NjcyNzQ2_size_16_color_FFFFFF_t_70]  
源代码：

package ch3_4;
    
    import java.util.Scanner;
    
    public class InteractionDemo {
        
    	public static void main(String[] args) {
        
    		int option;
    		int i;
    		float f;
    		String s;
    		System.out.println("----------------------------------------菜单----------------------------------------");
    		System.out.println("1.输入整数\t\t2.输入小数\t\t3.输入字符串\t\t0.退出");
    		System.out.println("------------------------------------------------------------------------------------");
    
    		Scanner scanner = new Scanner(System.in);
    		while (true) {
        
    			System.out.println("选项：");
    			option = scanner.nextInt();
    			switch (option) {
        
    			case 0:
    				System.out.println("\t确定要退出吗(y/n)");
    				s = scanner.next();
    				if (s.equalsIgnoreCase("y")) {
        
    					System.out.println("\t程序退出");
    					break;
    				} else {
        
    					break;
    				}
    			case 1:
    				System.out.println("\t请输入整数：");
    				i = scanner.nextInt();
    				System.out.println("\t你输入的是：" + i);
    				break;
    			case 2:
    				System.out.println("\t请输入小数：");
    				f = scanner.nextFloat();
    				System.out.println("\t你输入的是：" + f);
    			case 3:
    				System.out.println("\t请输入字符串：");
    				s = scanner.next();
    				System.out.println("\t你输入的是：" + s);
    			default:
    				System.out.println("\t请输入其他正确选项");
    				break;
    			}
    		}
    	}
    }

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ2NjcyNzQ2_size_16_color_FFFFFF_t_70]: /images/20230208/23b2081ee9a84446b8d35b10789fd84a.png