JAVA

how to delete object in java

You don't need to delete objects in Java. They are deleted by the
Garbage Collector when they are no longer referenced. For example, if
you have an object inside the block or function scope, the object will be 
removed when the scope finishes its execution.

how to delete a object in java

You should remove the references to it by assigning null or leaving the block where it was declared. After that, it will be automatically deleted by the garbage collector (not immediately, but eventually).

Example 1:

Object a = new Object();
a = null; // after this, if there is no reference to the object,
          // it will be deleted by the garbage collector
Example 2:

if (something) {
    Object o = new Object(); 
} // as you leave the block, the reference is deleted.
  // Later on, the garbage collector will delete the object itself.
Not something that you are currently looking for, but FYI: you can invoke the garbage collector with the call System.gc()

java delete object

Select the object with mouse. Press 'alt' + 'f4'.