阅读jdk API我们知道Object class在java.lang包下。Object class是Object结构的跟。
jdk1.8 API在线地址 ：https://blog.fondme.cn/apidoc/jdk-1.8-baidu/
Object class中的方法有
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.首先看equals()方法。
public boolean equals(Object obj) {
return (this == obj);
}
原文：https://www.cnblogs.com/cuixiaomeng/p/11367696.html