Stack using java

Wed Oct 24, 2012 10:45 pm

Java Stack Example (Push/PoP/Peak)

Code:: import java.awt.Color; public class StackExample { public static void main(String[] args) { Color c1 = new Color(54, 43, 75); Color c2 = new Color(4, 100, 175); Color c3 = new Color(100, 53, 160); JavaStack stack = new JavaStack(2); stack.push(c1); stack.push(c2); stack.push(c3); System.out.println(stack.pop()); System.out.println(stack.pop()); System.out.println(stack.pop());// Empty stack.push(c3); stack.push(c2); System.out.println(stack.pop()); System.out.println(stack.pop()); System.out.println(stack.pop());// Empty System.out.println(stack.pop());// Empty } }

Code:: public class JavaStack { private int top; // Array to store objects private Object[] stackBox; JavaStack(int capacity) { stackBox = new Object[capacity]; top = -1; } void push(Object value) { if (top+1 == stackBox.length) { System.out.println("For Value: " + value + "," + " We can't add more values to the " + " (Stack is full)"); } else { top++; stackBox[top] = value; } } Object peek() { if (top == -1) { System.out.println("Stack is empty"); return null; } else { return stackBox[top]; } } Object pop() { if (top == -1) { System.out.println("Stack is empty"); return null; } else { // Decreases the value after assigning it stackBox return stackBox[top--]; } } boolean isEmpty() { // True if empty return (top == -1); } }

The output is :

Code:: For Value: java.awt.Color[r=100,g=53,b=160], We can't add more values to the (Stack is full) java.awt.Color[r=4,g=100,b=175] java.awt.Color[r=54,g=43,b=75] Stack is empty null java.awt.Color[r=4,g=100,b=175] java.awt.Color[r=100,g=53,b=160] Stack is empty null Stack is empty null