Example usage for java.util WeakHashMap WeakHashMap

Introduction

In this page you can find the example usage for java.util WeakHashMap WeakHashMap.

Prototype

public WeakHashMap()

Source Link

Document

Constructs a new, empty WeakHashMap with the default initial capacity (16) and load factor (0.75).

Usage

From source file:Main.java

public static void main(String[] args) {
    WeakHashMap<String, String> weakHashMap = new WeakHashMap<String, String>();

    weakHashMap.put("1", "first");
    weakHashMap.put("2", "two");
    weakHashMap.put("3", "from java2s.com");

    // check existence of value "from java2s.com"
    System.out.println("Checking value 'three'");
    System.out.println(weakHashMap.containsValue("from java2s.com"));
}

From source file:Main.java

public static void main(String[] args) {
    WeakHashMap<String, String> weakHashMap = new WeakHashMap<String, String>();

    System.out.println("Putting values into the Map");
    weakHashMap.put("1", "first");
    weakHashMap.put("2", "two");
    weakHashMap.put("3", "from java2s.com");

    // checking the size of the Map
    System.out.println("Map size: " + weakHashMap.size());
}

From source file:Main.java

public static void main(String[] args) {
    WeakHashMap<String, String> weakHashMap = new WeakHashMap<String, String>();

    weakHashMap.put("1", "first");
    weakHashMap.put("2", "two");
    weakHashMap.put("3", "from java2s.com");

    // check key value 
    System.out.println("Checking value for key 1");
    System.out.println(weakHashMap.containsKey("1"));
}

From source file:Main.java

public static void main(String[] args) {
    WeakHashMap<String, String> weakHashMap = new WeakHashMap<String, String>();

    weakHashMap.put("1", "first");
    weakHashMap.put("2", "two");
    weakHashMap.put("3", "from java2s.com");

    // check existence of value for key 2
    System.out.println("Checking value for key 2");
    System.out.println(weakHashMap.get("2"));
}

From source file:Weak.java

public static void main(String args[]) {
    final Map map = new WeakHashMap();
    map.put(new String("Java2s"), "www.java2s.com");
    Runnable runner = new Runnable() {
        public void run() {
            while (map.containsKey("Java2s")) {
                try {
                    Thread.sleep(500);
                } catch (InterruptedException ignored) {
                }//from   w ww  .ja v a2  s . co m
                System.out.println("Waiting");
                System.gc();
            }
        }
    };
    Thread t = new Thread(runner);
    t.start();
    System.out.println("Main waiting");
    try {
        t.join();
    } catch (InterruptedException ignored) {
    }
}

From source file:Main.java

public static void main(String[] args) {
    WeakHashMap<String, String> weakHashMap = new WeakHashMap<String, String>();

    // check map contents
    System.out.println("Checking the map entries");
    System.out.println("Map is empty: " + weakHashMap.isEmpty());

    System.out.println("Putting values into the Map");
    weakHashMap.put("1", "first");
    weakHashMap.put("2", "two");
    weakHashMap.put("3", "from java2s.com");

    // checking Map
    System.out.println("Map is empty: " + weakHashMap.isEmpty());
}

From source file:Main.java

public static void main(String[] args) {
    WeakHashMap<String, String> weakHashMap = new WeakHashMap<String, String>();

    System.out.println("Putting values into the Map");
    weakHashMap.put("1", "first");
    weakHashMap.put("2", "two");
    weakHashMap.put("3", "from java2s.com");

    // checking Map
    System.out.println("Map: " + weakHashMap);

    // remove value at key 2      
    System.out.println("Returned value: " + weakHashMap.remove("2"));
    System.out.println("New Map: " + weakHashMap);
}

From source file:Main.java

public static void main(String[] args) {
    WeakHashMap<String, String> weakHashMap = new WeakHashMap<String, String>();

    System.out.println("Putting values into the Map");
    weakHashMap.put("1", "first");
    weakHashMap.put("2", "two");
    weakHashMap.put("3", "from java2s.com");

    // checking Map
    System.out.println("Map: " + weakHashMap);

    // putting value at key 2
    String str = (String) weakHashMap.put("2", "newvalue");
    System.out.println("Returned value: " + str);
    System.out.println("New Map: " + weakHashMap);
}

From source file:Main.java

public static void main(String args[]) {
    final Map<String, String> map = new WeakHashMap<String, String>();
    map.put(new String("A"), "B");
    Runnable runner = new Runnable() {
        public void run() {
            while (map.containsKey("A")) {
                try {
                    Thread.sleep(500);
                } catch (InterruptedException ignored) {
                }//  www  .j  av a2 s.c o  m
                System.gc();
            }
        }
    };

    Thread t = new Thread(runner);
    t.start();
    try {
        t.join();
    } catch (InterruptedException ignored) {
    }
}

From source file:Main.java

public static void main(String[] args) {
    WeakHashMap<String, String> weakHashMap = new WeakHashMap<String, String>();

    weakHashMap.put("1", "first");
    weakHashMap.put("2", "two");
    weakHashMap.put("3", "from java2s.com");

    // print the contents  
    System.out.println("Contents in the Map");
    System.out.println(weakHashMap);

    // call clear() method
    System.out.println("Clear the Map");
    weakHashMap.clear();/* ww w.ja v  a 2  s. co m*/

    // again print the contents
    System.out.println("Contents in the Map");
    System.out.println(weakHashMap);
}