EduCoder Java程序设计---Java面向对象（一） - 类与对象答案

客官°小女子只卖身不卖艺 2023-09-30 09:31 29阅读 0赞

#### 第1关：什么是类，如何创建类 ####

package step1;
    
    public class Test {
    	public static void main(String[] args) {
    		//创建Dog对象
    		//设置Dog对象的属性
    		Dog wuhuarou = new Dog();
    		wuhuarou.name = "五花肉";
    		wuhuarou.color  = "棕色";
    		wuhuarou.variety = "阿拉斯加"; 
    		
    		
    		//输出小狗的属性
    		System.out.println("名字：" + wuhuarou.name    + "，毛色：" +  wuhuarou.color  + "，品种：" + wuhuarou.variety );
    		
    		//调用方法
    		wuhuarou.eat();
    		wuhuarou.run();
    		
    	}
    }
    
    //在这里定义Dog类
    class Dog{
    	String name;
    	String color;
    	String variety;
    	void eat(){
    		System.out.println("啃骨头");
    	}
    	void run(){
    		System.out.println("叼着骨头跑");
    
    	}
    }

#### 第2关：构造方法 ####

package step2;
    
    import java.util.Scanner;
    
    public class Test {
    	public static void main(String[] args) {
    		Scanner sc = new Scanner(System.in);
    		String name = sc.next();
    		String sex = sc.next();
    		
    		//分别使用两种构造器来创建Person对象  
    		Person  person1 = new Person();
    		Person  person2 = new Person(name,sex);
    		
    		
    		
    	}
    }
    
    //创建Person对象，并创建两种构造方法
     class Person{
    	String name;
    	String sex;
    
    	public Person(){
    		System.out.println("一个人被创建了");
    	}
    	public Person(String pername ,String persex){
    		name = pername;
    		sex = persex;
    
    		System.out.print("姓名："+name+"，"+"性别："+sex+"，被创建了");
    	}
    }

#### 第3关：选择题 ####

#### ![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA54ix5L2g55qE6Zi_55m9fg_size_13_color_FFFFFF_t_70_g_se_x_16][] ####

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#### 第4关：This关键字 ####

package step3;
    
    import java.util.Scanner;
    
    public class Test {
    	public static void main(String[] args) {
    		Scanner sc = new Scanner(System.in);
    		String name = sc.next();
    		int age = sc.nextInt();
    		String sex = sc.next();
    		Person p = new Person(name,age,sex);
    		p.display();
    	}
    }
    
    class Person{
    	String name = "张三";
    	int age = 18; 
    	String sex = "男";
    // 请在此编写代码
    /********** Begin **********/	
    	public Person(String name,int age,String sex){
    		this(age);
    		this.name = name;
    		this.sex = sex;
    	}
    	
    	public Person(int age){
    		this.age = age;
    	}
    /********** End **********/	
    	
    	public void display(){
    		// String name = "李四";
    		// int age = 11;
    		// String sex = "男";
    		System.out.println("name：" + name);
    		System.out.println("age：" + age);
    		System.out.println("sex：" + sex);
    	}
    }

#### 第5关：类与对象练习 ####

package step4;
    
    import java.util.Scanner;
    
    public class Test {
    	
    	public static void main(String[] args) {
    		Scanner sc = new Scanner(System.in);
    		String theMa = sc.next();
    		int quantity = sc.nextInt();
    		boolean likeSoup = sc.nextBoolean();
    
    		//使用三个参数的构造方法创建WuMingFen对象  取名 f1
    		//使用两个参数的构造方法创建WuMingFen对象  取名 f2
    		//使用无参构造方法创建WuMingFen对象  取名 f3
    		WuMingFen f1 = new WuMingFen(theMa,quantity,likeSoup);
    		WuMingFen f2 = new WuMingFen(theMa,quantity);
    		WuMingFen f3 = new WuMingFen();
    
    		f3.theMa = "酸辣";
    		f3.quantity = 2;
    		f3.likeSoup = true;
    
    		//分别调用三个类的 check方法
    		f1.check();
    		f2.check();
    		f3.check();
    		
    	}
    }

//在这里添加包名  step4
    package step4;
    		//创建类 添加属性和方法
    		public class WuMingFen {
    			String theMa;
    			int quantity;
    			boolean likeSoup;
    
    
    			public WuMingFen(String theMa ,int quantity ,boolean likeSoup){
    				this.theMa = theMa;
    				this.quantity = quantity;
    				this.likeSoup = likeSoup;
    			}
    
    			public WuMingFen(String theMa, int quantity){
    				this.theMa = theMa;
    				this.quantity = quantity;
    			}
    			public WuMingFen(){
    
    			}
    			public void check(){
    				System.out.println("面码：" + theMa + "，粉的份量：" + quantity + "两，是否带汤："+ likeSoup);
    			}
    
    		}

#### 第6关：static关键字 ####

package step5;
    
    public class Test {
    	
    	static String name = "楚留香";
    	
    	public static void hello(){
    		System.out.println("hello educoder");
    	}
    	public static void main(String[] args) {
    		hello();
    		System.out.println("我叫" + name);
    		study();
    	}
    	
    	public static void study(){
    		System.out.println("我喜欢在educoder上学习java");
    	}
    	
    }

#### 第7关：选择题 ####

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