java中object类实例分析

问：什么是Object类？

答：Object类存储在java.lang包中，是所有java类(Object类除外)的终极父类。当然，数组也继承了Object类。然而，接口是不继承Object类的，Object类不作为接口的父类。

下面，我们就通过实例，对object进行分析

public class ObjectStu {
	
	public static void main(String[] args)
	 {
		Person per = new Person("小王",10,150);
		Person per1 = new Person("小王",20,140);
		Person per2 = per;
		System.out.println(per==per1);
		System.out.println(per.equals(per1));
		String str = "123";
		str.equals("123");
		str.hashCode();
		System.out.println(per.hashCode());
		System.out.println(per1.hashCode());
		System.out.println(per2.hashCode());
		System.out.println(per);
		System.out.println(per1);
	}
}
class Person {
	String name;
	int age;
	int height;
	public Person(String name, int age,int height)
	 {
		super();
		this.height = height;
		this.name = name;
		this.age = age;
	}
	
	//重写hashcode
	
	@Override
	 public int hashCode()
	 {
		final int prime = 31;
		int result = 1;
		result = prime * result + age;
		result = prime * result + height;
		result = prime * result + ((name == null) ? 0 : name.hashCode());
		return result;
	}
	@Override
	 public Boolean equals(Object obj)
	 {
		if (this == obj)
		  return true;
		if (obj == null)
		  return false;
		if (getClass() != obj.getClass())
		  return false;
		Person other = (Person) obj;
		if (age != other.age)
		  return false;
		if (height != other.height)
		  return false;
		if (name == null)
		 {
			if (other.name != null)
			  return false;
		} else if (!name.equals(other.name))
		  return false;
		return true;
	}
	@Override
	 public String toString()
	 {
		return "Person[name="+name+",age="+age+"]";
	}
}

总结

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