java入门第二季--继承--Object类
Object类
toString()方法
代码
/javaDemo3/src/com/imooc/Animal.java
package com.imooc;
public class Animal {
public Animal() {
}
}
/javaDemo3/src/com/imooc/Dog.java
package com.imooc;
import java.util.*;
public class Dog extends Animal {
public Dog() {
System.out.println("Dog类执行了" );
}
}
/javaDemo3/src/com/imooc/Initail.java
package com.imooc;
public class Initail {
public static void main(String[] args) {
// TODO Auto-generated method stub
Dog dog = new Dog();
System.out.println(dog);
}
}
重写toString()方法
/javaDemo3/src/com/imooc/Dog.java
右键 -> source -> genenor toString
]
package com.imooc;
import java.util.*;
public class Dog extends Animal {
public Dog() {
System.out.println("Dog类执行了" );
}
public String toString() {
return "Dog [age=" + age + "]";
}
}
正文到此结束
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