Garbage Collector In Java

Garbage Collector In Java

In this Example, we will discuss an important chapter of Java, Garbage Collector but Before we can start to make the Garbage Collector Program, click on the Advertisements , available on this page.

/** Example shows garbage collector in action
    Note that the finalize() method of object GC1
    runs without being specifically called and that
    the id's of garbage collected objects are not
    always sequential.
*/

class TestGC {

    public static void main(String[] args) {
    
        Runtime rt = Runtime.getRuntime();
    
        System.out.println("Available Free Memory: " + rt.freeMemory());
        
        for(int i=0; i<10; i++ ) {
            GC1 x = new GC1(i);                        
        }

        System.out.println("Free Memory before call to gc():  " +                 
                rt.freeMemory());
        System.runFinalization();
        System.gc();
        System.out.println(" Free Memory after call to gc():  " +                 
                rt.freeMemory());                
        
    }
}

class GC1 {

    String str;
    int id;

    GC1(int i) {
        this.str = new String("abcdefghijklmnopqrstuvwxyz");        
        this.id = i;
    }
    
    protected void finalize() {
        System.out.println("GC1 object " + id + " has been finalized.");
    }
    

}

Compile and Run on this Program for Better Understanding this Program.

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