Source Object class

 We know that reading jdk API Object class in the java.lang package. Object class is with the Object structure.

  jdk1.8 API online address: https://blog.fondme.cn/apidoc/jdk-1.8-baidu/

 Object class has a method of

                                      hashCode(),equals(),clone(),notify(),notifyAll(),wait(),finalize()

package java.lang;

 
public class Object {

    private static native void registerNatives();
    static {
        registerNatives();
    }
    public final native Class<?> getClass();
    public native int hashCode();
    public boolean equals(Object obj) {
        return (this == obj);
    }
    protected native Object clone() throws CloneNotSupportedException;   
    public String toString() {
        return getClass().getName() + "@" + Integer.toHexString(hashCode());
    }
    public final native void notify();
    public final native void notifyAll();
    public final native void wait(long timeout) throws InterruptedException;
    public final void wait(long timeout, int nanos) throws InterruptedException {
        if (timeout < 0) {
            throw new IllegalArgumentException("timeout value is negative");
        }
        if (nanos < 0 || nanos > 999999) {
            throw new IllegalArgumentException(
                               "nanosecond timeout value out of range");
        }
        if (nanos > 0) {
            timeout++;
        }
        wait(timeout);
    }
    public final void wait() throws InterruptedException {
        wait(0);
    }
    protected void finalize() throws Throwable { }
}

 1. First See equals () method.

    public boolean equals(Object obj) {
        return (this == obj);
    }