java8 object源码

Object类中大部分都是用 native 修饰的方法

这个关键字修饰的方法底层是c/c++编写的程序编译后dll文件，java加载dll文件后，可用通过本地方法调用dll中函数.

public class Object {
    //非native方法
    public boolean equals(Object obj) {
        return (this == obj);
    }
    public String toString() {
        return getClass().getName() + "@" + Integer.toHexString(hashCode());
    }  
    //虽然不是native方法但是最终都调用了native方法
    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 { }
    //以下为native方法 
    private static native void registerNatives();
    static {
        registerNatives();
    }
    public final native Class<?> getClass();
    public native int hashCode();
    protected native Object clone() throws CloneNotSupportedException;
    public final native void notify();
    public final native void notifyAll();
    public final native void wait(long timeout) throws InterruptedException;
    
}

 

来源：CSDN

作者：Hefei19881002

链接：https://blog.csdn.net/qq_23292875/article/details/103824532