1. Object 简介
- Object是所有类的超类,包括Arrays类都实现了Object类的方法;
2. Object UML
3. Object 源码
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(); //通知第一个wait或最后一个wait的线程继续运行
public final native void notifyAll(); //通知所有wait的线程依次(可能顺序可能逆序)继续运行
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); //wait(0)主要是为了让线程放锁,让其他线程有机会得到锁
}
protected void finalize() throws Throwable { }
}
4. Object使用示例
