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    Program To Show Garbage Collection in Java

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    Shweta Sharma
    Garbage collection is the process of automatically freeing objects that are no longer referenced by the program. This prevents memory leaks and bugs. When an object is no longer referenced, the garbage collector recycles the heap space for new objects. It determines which objects are unreferenced and frees their memory. This can combat fragmentation and improve performance over manually managing memory.

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    Program To Show Garbage Collection in Java

    Uploaded by

    Shweta Sharma
    37 views3 pages
    Garbage collection is the process of automatically freeing objects that are no longer referenced by the program. This prevents memory leaks and bugs. When an object is no longer referenced, the garbage collector recycles the heap space for new objects. It determines which objects are unreferenced and frees their memory. This can combat fragmentation and improve performance over manually managing memory.

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    java garbage collection

    Original Title

    Garbage Collection

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    Garbage collection is the process of automatically freeing objects that are no longer referenced by the program. This prevents memory leaks and bugs. When an object is no longer referenced, the garbage collector recycles the heap space for new objects. It determines which objects are unreferenced and frees their memory. This can combat fragmentation and improve performance over manually managing memory.

    Copyright:

    Attribution Non-Commercial (BY-NC)
    Download as DOCX, PDF, TXT or read online from Scribd
    Download as docx, pdf, or txt
    37 views3 pages

    Program To Show Garbage Collection in Java

    Uploaded by

    Shweta Sharma
    Garbage collection is the process of automatically freeing objects that are no longer referenced by the program. This prevents memory leaks and bugs. When an object is no longer referenced, the garbage collector recycles the heap space for new objects. It determines which objects are unreferenced and frees their memory. This can combat fragmentation and improve performance over manually managing memory.

    Copyright:

    Attribution Non-Commercial (BY-NC)
    Download as DOCX, PDF, TXT or read online from Scribd
    Download as docx, pdf, or txt
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    Garbage Collection

    Objects are created by Java's "new" operator, and memory for new objects is allocated on the heap at run time. Garbage collection is the process of automatically freeing objects that are no longer referenced by the program. This frees the programmer from having to keep track of when to free allocated memory, thereby preventing many potential bugs and headaches. The name "garbage collection" implies that objects that are no longer needed by the program are "garbage" and can be thrown away. A more accurate and up-to-date metaphor might be "memory recycling." When an object is no longer referenced by the program, the heap space it occupies must be recycled so that the space is available for subsequent new objects. The garbage collector must somehow determine which objects are no longer referenced by the program and make available the heap space occupied by such unreferenced objects. In the process of freeing unreferenced objects, the garbage collector must run any finalizers of objects being freed. In addition to freeing unreferenced objects, a garbage collector may also combat heap fragmentation. Heap fragmentation occurs through the course of normal program execution. New objects are allocated, and unreferenced objects are freed such that free blocks of heap memory are left in between blocks occupied by live objects. Requests to allocate new objects may have to be filled by extending the size of the heap even though there is enough total unused space in the existing heap. This will happen if there is not enough contiguous free heap space available into which the new object will fit. On a virtual memory system, the extra paging required to service an ever growing heap can degrade the performance of the executing program.

    Garbage collection relieves programmers from the burden of freeing allocated memory. Knowing when to explicitly free allocated memory can be very tricky. Giving this job to the JVM has several advantages. First, it can make programmers more productive. When programming in non-garbage-collected languages the programmer can spend many late hours (or days or weeks) chasing down an elusive memory problem. When programming in Java the programmer can use that time more advantageously by getting ahead of schedule or simply going home to have a life.

    // Program to show garbage collection in java.

    class cons {

    int length;

    cons(int a) {

    length = a;

    void show() {

    System.out.println("length = " + length);

    protected void finalize() is destroyed {

    // finalize method is automatically invoked when any object

    System.out.println("Object is destroying");

    public static void main(String args[]) {

    cons obj1 = new cons(15); obj1.show(); obj1 = null; // Now obj1 has null reference, so it can't be used further.

    System.gc(); // Calling gc method for garbage collection.

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