'How to write a method using hashtable

How to implement a boolean contains(T elem){} method in a hashtable?

This is what I have:

public boolean contains (T elem) {
    if ( this.table != null || this.size != 0 ) {
        this.table = null;
        size--;
        return false;
    }
    else { return true; }
}
javahashtable


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