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This01.java
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44 lines (37 loc) · 1.1 KB
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public class This01 {
//编写一个main方法
public static void main(String[] args) {
Dog dog1 = new Dog("大壮", 3);
System.out.println("dog1的hashcode=" + dog1.hashCode());
//dog1调用了 info()方法
dog1.info();
System.out.println("============");
Dog dog2 = new Dog("大黄", 2);
System.out.println("dog2的hashcode=" + dog2.hashCode());
dog2.info();
}
}
class Dog{ //类
String name;
int age;
// public Dog(String dName, int dAge){//构造器
// name = dName;
// age = dAge;
// }
//如果我们构造器的形参，能够直接写成属性名，就更好了
//但是出现了一个问题，根据变量的作用域原则
//构造器的name 是局部变量，而不是属性
//构造器的age 是局部变量，而不是属性
//==> 引出this关键字来解决
public Dog(String name, int age){//构造器
//this.name 就是当前对象的属性name
this.name = name;
//this.age 就是当前对象的属性age
this.age = age;
System.out.println("this.hashCode=" + this.hashCode());
}
public void info(){//成员方法,输出属性x信息
System.out.println("this.hashCode=" + this.hashCode());
System.out.println(name + "\t" + age + "\t");
}
}