Example usage for java.lang Object Object

List of usage examples for java.lang Object Object

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Introduction

In this page you can find the example usage for java.lang Object Object.

Prototype

@HotSpotIntrinsicCandidate
public Object()

Source Link

Document

Constructs a new object.

Usage

From source file:Main.java

public static void main(String[] argv) throws Exception {

    Object o = new Object();
    Class sup = o.getClass().getSuperclass(); // null
}

From source file:Main.java

public static void main(String[] argv) throws Exception {
    Object o = new Object();

    System.out.println(Thread.holdsLock(o));
    synchronized (o) {
        System.out.println(Thread.holdsLock(o));
    }//  w ww  . j  a v  a 2 s  . com
}

From source file:Main.java

public static void main(String str[]) {
    final Object monitor = new Object();
    new Thread() {
        public void run() {
            try {
                synchronized (monitor) {
                    System.out.println("10 seconds ...");
                    monitor.wait(10000);
                    System.out.println("Wait over");
                }//from   w  ww.  j  a  v a  2s. c  o m
            } catch (Throwable t) {
                t.printStackTrace();
            }
        }
    }.start();
}

From source file:MainClass.java

public static void main(String[] args) throws Exception {
    Object f = new Object() {
        public void finalize() {
            System.out.println("Running finalize()");
        }//from  w w  w.j  av a2 s  .c om
    };
    Runtime.getRuntime().addShutdownHook(new Thread() {
        public void run() {
            System.out.println("Running Shutdown Hook");
        }
    });

    f = null;
    System.gc();

    System.out.println("Calling System.exit()");
    System.exit(0);
}

From source file:Main.java

public static void main(String[] args) {
    Object obj1 = new Object();
    Object obj2 = new Object();
    CountDownLatch latch = new CountDownLatch(2);

    new Locker(obj1, obj2, latch).start();
    new Locker(obj2, obj1, latch).start();
}

From source file:AllFieldsSnippet.java

public static void main(String[] args) {
    Object obj = new Object();
    //start extract AllFieldsSnippet

    Class cls = obj.getClass();//from  w  w  w. ja va2  s  .  co  m
    List accum = new LinkedList();
    while (cls != null) {
        Field[] f = cls.getDeclaredFields();
        for (int i = 0; i < f.length; i++) {
            accum.add(f[i]);
        }
        cls = cls.getSuperclass();
    }
    Field[] allFields = (Field[]) accum.toArray(new Field[accum.size()]);
    //stop extract AllFieldsSnippet
}

From source file:Main.java

public static void main(String[] args) {
    ReferenceQueue referenceQueue = new ReferenceQueue();
    Object object = new Object() {
        public String toString() {
            return "Referenced Object";
        }//from   ww w. j  a v  a  2  s  .  c  o m
    };
    Object data = new Object() {
        public String toString() {
            return "Data";
        }
    };

    HashMap map = new HashMap();
    Reference reference = new SoftReference(object, referenceQueue);

    map.put(reference, data);

    System.out.println(reference.get());
    System.out.println(map.get(reference));
    System.out.println(reference.isEnqueued());

    System.gc();
    System.out.println(reference.get());
    System.out.println(map.get(reference));
    System.out.println(reference.isEnqueued());

    object = null;
    data = null;

    System.gc();
    System.out.println(reference.get());
    System.out.println(map.get(reference));
    System.out.println(reference.isEnqueued());
}

From source file:Main.java

public static void main(String[] args) {
    ReferenceQueue referenceQueue = new ReferenceQueue();
    Object object = new Object() {
        public String toString() {
            return "Referenced Object";
        }//from  w w w  .  j av  a  2 s .com
    };

    Object data = new Object() {
        public String toString() {
            return "Data";
        }
    };

    HashMap map = new HashMap();
    Reference reference = null;
    System.out.println("Testing PhantomReference.");
    reference = new PhantomReference(object, referenceQueue);

    map.put(reference, data);

    System.out.println(reference.get());
    System.out.println(map.get(reference));
    System.out.println(reference.isEnqueued());

    System.gc();
    System.out.println(reference.get());
    System.out.println(map.get(reference));
    System.out.println(reference.isEnqueued());

    object = null;
    data = null;

    System.gc();
    System.out.println(reference.get());
    System.out.println(map.get(reference));
    System.out.println(reference.isEnqueued());
}

From source file:Main.java

public static void main(String[] args) {
    // Boolean conversion
    System.out.printf("'%b', '%6b', '%.4b'%n", true, false, true);
    System.out.printf("'%b', '%6b', '%.4b'%n", "A", "B", "C");
    System.out.printf("'%B', '%6b',  '%.4b'%n", "A", "B", "C");
    System.out.printf("%b %n", 2014);
    System.out.printf("%b %n", new Object());

    // String conversion
    System.out.printf("'%s',  '%5s',  '%.3s'%n", "A", "B", "C");
    System.out.printf("'%S',  '%5S', '%.3S'%n", "A", "B", "C");

    // Use '-' flag to left-justify the result. 
    // width requires the '-' flag
    System.out.printf("'%S', '%-5S', '%.3S'%n", "A", "B", "C");
    System.out.printf("%s %n", 2014);
    System.out.printf("%s %n", true);
    System.out.printf("%s %n", new Object());

    // Hash Code conversion
    System.out.printf("'%h', '%5h', '%.3h'%n", "A", "B", "A");
    System.out.printf("'%H', '%5H',  '%.3H'%n", "A", "B", "A");
    System.out.printf("%h %n", 2014);
    System.out.printf("%h %n", true);
    System.out.printf("%h %n", new Object());
}

From source file:Main.java

public static void main(String[] args) {
    ReferenceQueue referenceQueue = new ReferenceQueue();
    Object object = new Object() {
        public String toString() {
            return "Referenced Object";
        }/* ww w. jav a2 s .  c  o  m*/
    };

    Object data = new Object() {
        public String toString() {
            return "Data";
        }
    };

    HashMap map = new HashMap();
    Reference reference = new SoftReference(object, referenceQueue);

    map.put(reference, data);

    System.out.println(reference.get());
    System.out.println(map.get(reference));
    System.out.println(reference.isEnqueued());

    System.gc();
    System.out.println(reference.get());
    System.out.println(map.get(reference));
    System.out.println(reference.isEnqueued());

    object = null;
    data = null;

    System.gc();
    System.out.println(reference.get());
    System.out.println(map.get(reference));
    System.out.println(reference.isEnqueued());
}