Object类是所有java类的父类。

 

用户定义了如下一个Person

public class Person{}

在类定义中并没有明确继承Object类,但是编译器会自动的完成这个过程。

既然所有类都继承自Object,那么它所具有的方法一定很重要。接下来就看看Object所具有的一些方法。

 1 public class Object {
 2 public final native Class<?> getClass();
 3 public native int hashCode();
 4      public boolean equals(Object obj) {
 5         return (this == obj);
 6 }
 7 protected native Object clone() throws CloneNotSupportedException;
 8      public String toString() {
 9         return getClass().getName() + "@" + Integer.toHexString(hashCode());
10     }
11 public final native void notify();
12 public final native void notifyAll();
13       public final native void wait(long timeout) throws InterruptedException;
14      public final void wait(long timeout, int nanos) throws InterruptedException {
15         if (timeout < 0) {
16             throw new IllegalArgumentException("timeout value is negative");
17         }
18         if (nanos < 0 || nanos > 999999) {
19             throw new IllegalArgumentException(
20                                 "nanosecond timeout value out of range");
21         }
22         if (nanos >= 500000 || (nanos != 0 && timeout == 0)) {
23             timeout++;
24         }
25         wait(timeout);
26     }
27 public final void wait() throws InterruptedException {
28         wait(0);
29     }
30 }
Object类定义

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