EduCoder Java-Programmierung --- Einführung in Java (Kapitel 4) - Antworten zur Verzweigungsstruktur

Ebene 1: if...else der Java-Zweigstruktur

package step2;

import java.util.Scanner;

public class HelloIfStep2 {
	public static void main(String[] args) {
		Scanner input = new Scanner(System.in);
		/******start******/
		System.out.println("请输入学员成绩：");
		int score = input.nextInt();
		if(score>=85&&score <=100){
			System.out.println("优，非常棒！");
		}
		else{
			System.out.println("良，下次加油！");
		}
				
		/******end******/
	}
}

Stufe 2: if-Anweisung Testfragen

Level 3: Mehrere ifs der Java-Zweigstruktur

package step3;

import java.util.Scanner;

public class HelloStep3 {
	public static void main(String[] args) {
		System.out.println("星级成绩评定系统");
		System.out.println("请输入成绩：");
		Scanner sc = new Scanner(System.in);
		/******start******/
		int score = sc.nextInt();
		if(score>=90&&score<=100){
			System.out.println("*****五星成绩");
		}
		else if(score<90&&score>=80){
			System.out.println("****四星成绩");
		}
		else if (score<80&&score>=70) {
			System.out.println("***三星成绩");
		}

		else if(score<70&&score>=60){
			System.out.println("**俩星成绩");
		} 

		else {
			System.out.println("无星成绩");
		}
		
		
		/******end******/
	}
}

Ebene 4: Wechsel der Java-Zweigstruktur

public class HelloSwitch {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		
		System.out.println("请输入月份：");
		
		int input = sc.nextInt();	//获取输入的月份
		
        //通过输入的月份来判断当前季节并输出
		/*****start*****/
		switch(input){
			
			case 3:
			case 4:
			case 5:
				System.out.print(input+"月是春天");
				break;
			case 6:
			case 7:
			case 8:
				System.out.print(input+"月是夏天");
				break;
			case 9:
			case 10:
			case 11:
				System.out.print(input+"月是秋天");
				break;
			default:
			System.out.print(input+"月是冬天");
				break;

		}
		
		/*****end*****/
		
	}
}

Stufe 5: Testfragen zum Switch-Statement

Level 6: Komm schon, ich bin der BOSS!

package step5;

import java.util.Scanner;

public class Practice {
    
    	final static Scanner sc = new Scanner(System.in);	//创建扫描仪

		//第一题
		public void first(){
			System.out.println("请输入人数：");
            int input = sc.nextInt();		//获取输入的数据
            
			/*****start*****/
			if (input<10&&input>0) {
				System.out.println("打半场");
			} else {
				System.out.println("打全场");
			}
			
			/*****end*****/
		}
		
		//第二题
		public void second(){
			System.out.println("请输入今天星期几：");
            int input = sc.nextInt();		//获取输入的数据
            
			/*****start*****/
			if (input == 1) 
				System.out.println("今天吃米饭");
			
			else if(input == 2)
				System.out.println("今天吃牛排");

			
			else if(input ==3)
				System.out.println("今天吃鸡排");
			
			else 
				System.out.println("今天吃红烧肉");

			/*****end*****/
		}	
		//第三题
		public void third(){
			System.out.println("请输入今天星期几：");
            int input = sc.nextInt();		//获取输入的数据
            
			/*****start*****/
			switch(input){
				case 1:
					System.out.println("今天吃米饭");
				break;
				case 2:
					System.out.println("今天吃牛排");
				break;
				case 3:
					System.out.println("今天吃鸡排");
				break;
				default :
					System.out.println("今天吃红烧肉");
				break;
			}
			/*****end*****/
		}
}