Java Definition Stack

Public interface Stackinterface {public
 Boolean isempty ();
 public boolean isfull ();
 Public boolean push (object);
 Public Object pop ();
 Public Object Peek (); Get stack top element
 }

public class Javastack implements Stackinterface {public
	
	object[] table;
	public int top;
	
	/** constructor with no parameters, construct 10 storage units
	/public javastack () {
		table = new OBJECT[10];
		top =-1;
	}
	Public javastack (int stacknum) {
		table = new Object[stacknum];
		top =-1;
		
	}

	@Override Public
	Boolean IsEmpty () {return
		(top = 1);
	}

	@Override Public
	Boolean isfull () {return
		(top >= table.length-1);
	}

	@Override public
	Boolean push (Object object) {
		if (!isfull ()) {
			
			Table[++top] = new Object ();
			Table[top] = object;
			return true;
		}
		System.out.println ("Stack full, unable to perform stack operation.") ");
		return false;
	}

	@Override Public
	Object Pop () {
		object = null;
		if (!isempty ()) {
			object = Table[top];
			Table[top] = null;
			top--;
			
		}
		return object;
	}

	@Override Public
	Object Peek () {
		if (!isempty ()) {return
			table[top];
			
		}
		return null;
	}


}