java基础 day13 类与类之间的关系异常

以你之姓@ 2023-06-10 13:24 48阅读 0赞

## 类与类之间的关系： ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzIxNjk0MDQ5_size_16_color_FFFFFF_t_70]  
![在这里插入图片描述][20191028212738305.png]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzIxNjk0MDQ5_size_16_color_FFFFFF_t_70 1]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzIxNjk0MDQ5_size_16_color_FFFFFF_t_70 2]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzIxNjk0MDQ5_size_16_color_FFFFFF_t_70 3]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzIxNjk0MDQ5_size_16_color_FFFFFF_t_70 4]  
![在这里插入图片描述][20191029222534593.png]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzIxNjk0MDQ5_size_16_color_FFFFFF_t_70 5]  
tip  
![在这里插入图片描述][2019102922334674.png]  
\--------------------------------

## 异常： ##

![在这里插入图片描述][20191029225310552.png]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzIxNjk0MDQ5_size_16_color_FFFFFF_t_70 6]

### 算术异常 ###

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzIxNjk0MDQ5_size_16_color_FFFFFF_t_70 7]

### 受检异常 ###

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzIxNjk0MDQ5_size_16_color_FFFFFF_t_70 8]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzIxNjk0MDQ5_size_16_color_FFFFFF_t_70 9]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzIxNjk0MDQ5_size_16_color_FFFFFF_t_70 10]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzIxNjk0MDQ5_size_16_color_FFFFFF_t_70 11]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzIxNjk0MDQ5_size_16_color_FFFFFF_t_70 12]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzIxNjk0MDQ5_size_16_color_FFFFFF_t_70 13]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzIxNjk0MDQ5_size_16_color_FFFFFF_t_70 14]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzIxNjk0MDQ5_size_16_color_FFFFFF_t_70 15]

### throws抛出处理： ###

![在这里插入图片描述][20191104213826652.png]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzIxNjk0MDQ5_size_16_color_FFFFFF_t_70 16]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzIxNjk0MDQ5_size_16_color_FFFFFF_t_70 17]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzIxNjk0MDQ5_size_16_color_FFFFFF_t_70 18]

### 方法覆盖中的异常处理： ###

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzIxNjk0MDQ5_size_16_color_FFFFFF_t_70 19]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzIxNjk0MDQ5_size_16_color_FFFFFF_t_70 20]

### 自定义异常： ###

异常在开发中的应用：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzIxNjk0MDQ5_size_16_color_FFFFFF_t_70 21]  
年龄不合理异：

package wwl.demo01;
    
    public class Test01 {
        
    
    	public static void main(String[] args) {
        
    		person p1 = new person();
    		p1.setName("网五");
    		try {
        
    			p1.setAge(9999);
    		} catch (AgeException e) {
        
    			// TODO Auto-generated catch block
    			e.printStackTrace();
    		}
    		p1.setGender('女');
    		System.out.println( p1 );
    	}
    
    }

package wwl.demo01;
    /**
     * person类
     *
     */
    public class person {
        
    	private String name;
    	private int age;
    	private char gender;
    	
    	@Override
    	public String toString() {
        
    		return "person [name=" + name + ", age=" + age + ", gender=" + gender + "]";
    	}
    
    	public String getName() {
        
    		return name;
    	}
    
    	public void setName(String name) {
        
    		this.name = name;
    	}
    
    	public int getAge() {
        
    		return age;
    	}
    //  4.throw所在的方法通过throws声明该异常
    	public void setAge(int age) throws AgeException{
        
    		//对数据进行验证
    		if(age >= 0 && age < 130) {
        
    			this.age = age;
    		}else {
        
    //			年龄不合法抛出异常
    //			3.通过throw抛出一个异常对象
    			throw new AgeException("年龄越界");
    		}
    	}
    
    	public char getGender() {
        
    		return gender;
    	}
    
    	public void setGender(char gender) {
        
    		this.gender = gender;
    	}
    	
    	
    }

package wwl.demo01;
    /**
     * 套路：
     * 1.定义一个类继承Exception
     *
     */
    public class AgeException extends Exception {
        
    //	2.一般定义两个构造方法
    	public AgeException() {
        
    		super();
    		// TODO Auto-generated constructor stub
    	}
    //  有字符串的构造方法，这个字符串参数是异常的信息
    	public AgeException(String message) {
        
    		super(message);
    		// TODO Auto-generated constructor stub
    	}
    	
    }

性别不合理异常

package wwl.demo01;
    /**
     * 自定义性别异常类
     *
     */
    public class sexexception extends Exception {
        
    
    	public sexexception() {
        
    		super();
    		// TODO Auto-generated constructor stub
    	}
    
    	public sexexception(String message) {
        
    		super(message);
    		// TODO Auto-generated constructor stub
    	}
    	
    }

package wwl.demo01;
    /**
     * person类
     *
     */
    public class person {
        
    	private String name;
    	private int age;
    	private String gender;
    	
    	@Override
    	public String toString() {
        
    		return "person [name=" + name + ", age=" + age + ", gender=" + gender + "]";
    	}
    
    	public String getName() {
        
    		return name;
    	}
    
    	public void setName(String name) {
        
    		this.name = name;
    	}
    
    	public int getAge() {
        
    		return age;
    	}
    //  4.throw所在的方法通过throws声明该异常
    	public void setAge(int age) throws AgeException{
        
    		//对数据进行验证
    		if(age >= 0 && age < 130) {
        
    			this.age = age;
    		}else {
        
    //			年龄不合法抛出异常
    //			3.通过throw抛出一个异常对象
    			throw new AgeException("年龄越界");
    		}
    	}
    
    	public String getGender() {
        
    		return gender;
    	}
    
    	public void setGender(String gender) throws sexexception {
        
    		if("男".equals(gender) || "女".equals(gender)) {
        
    			this.gender = gender; 
    		}else {
        
    			//抛出性别不合法异常！
    			throw new sexexception("性别不合法");
    		}
    
    	}
    	
    	
    }

package wwl.demo01;
    
    public class Test01 {
        
    
    	public static void main(String[] args) {
        
    		person p1 = new person();
    		p1.setName("网五");
    		try {
        
    			p1.setAge(9999);
    		} catch (AgeException e) {
        
    			// TODO Auto-generated catch block
    			e.printStackTrace();
    		}
    		try {
        
    			p1.setGender("女是");
    		} catch (sexexception e) {
        
    			// TODO Auto-generated catch block
    			e.printStackTrace();
    		}
    		System.out.println( p1 );
    	}
    
    }

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[2019102922334674.png]: /images/20230531/91a14240744e4372b68137590707e50a.png
[20191029225310552.png]: /images/20230531/ed0952136bd140c6b4586b5e2f0c4bff.png
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