JAVA EXAMPLE PROGRAMS

JAVA EXAMPLE PROGRAMS

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Convert a decimal into a binary number using stack.


This example shows how to convert decimal number into a binary number using stack.


package com.java2novice.ds.stack;

public class MyDecimalToBinary {

	public static String convertDecialToBinary(int number){
		
		StringBuilder binary = new StringBuilder();
		MyDynamicStack stack = new MyDynamicStack(10);
		if(number == 0){
			binary.append("0");
		} else {
			while(number != 0){
				stack.push(number%2);
				number = number/2;
			}
		}
		while(!stack.isStackEmpty()){
			try {
				binary.append(stack.pop());
			} catch (Exception e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
		return binary.toString();
	}
	
	public static void main(String a[]){
		System.out.println("Binary value of 2 is: "+convertDecialToBinary(2));
		System.out.println("Binary value of 15 is: "+convertDecialToBinary(15));
		System.out.println("Binary value of 23 is: "+convertDecialToBinary(23));
	}
}


class MyDynamicStack {

	private int stackSize;
	private int[] stackArr;
	private int top;

	/**
	 * constructor to create stack with size
	 * @param size
	 */
	public MyDynamicStack(int size) {
		this.stackSize = size;
		this.stackArr = new int[stackSize];
		this.top = -1;
	}

	/**
	 * This method adds new entry to the top 
	 * of the stack
	 * @param entry
	 * @throws Exception 
	 */
	public void push(int entry){
		if(this.isStackFull()){
			System.out.println(("Stack is full. Increasing the capacity."));
			this.increaseStackCapacity();
		}
		System.out.println("Adding: "+entry);
		this.stackArr[++top] = entry;
	}

	/**
	 * This method removes an entry from the 
	 * top of the stack.
	 * @return
	 * @throws Exception 
	 */
	public int pop() throws Exception {
		if(this.isStackEmpty()){
			throw new Exception("Stack is empty. Can not remove element.");
		}
		int entry = this.stackArr[top--];
		//System.out.println("Removed entry: "+entry);
		return entry;
	}
	
	/**
	 * This method returns top of the stack
	 * without removing it.
	 * @return
	 */
	public long peek() {
		return stackArr[top];
	}

	private void increaseStackCapacity(){
		
		int[] newStack = new int[this.stackSize*2];
		for(int i=0;i<stackSize;i++){
			newStack[i] = this.stackArr[i];
		}
		this.stackArr = newStack;
		this.stackSize = this.stackSize*2;
	}
	
	/**
	 * This method returns true if the stack is 
	 * empty
	 * @return
	 */
	public boolean isStackEmpty() {
		return (top == -1);
	}

	/**
	 * This method returns true if the stack is full
	 * @return
	 */
	public boolean isStackFull() {
		return (top == stackSize - 1);
	}

	public static void main(String[] args) {
		MyDynamicStack stack = new MyDynamicStack(2);
		for(int i=1;i<10;i++){
			stack.push(i);
		}
		for(int i=1;i<4;i++){
			try {
				stack.pop();
			} catch (Exception e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
	}
}

Output:
Adding: 0
Adding: 1
Binary value of 2 is: 10
Adding: 1
Adding: 1
Adding: 1
Adding: 1
Binary value of 15 is: 1111
Adding: 1
Adding: 1
Adding: 1
Adding: 0
Adding: 1
Binary value of 23 is: 10111
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List of Stack Data Structure Examples

  1. Stack introduction & implementation
  2. Java Dynamic Stack Implementation
  3. Stack implementation using generics bounded type.
  4. Reverse a word or string using Stack data structure.
  5. Write a program to find out delimiter matching using stack.
  6. Convert a decimal into a binary number using stack.
  7. Towers of Hanoi implementation using stack.
  8. Evaluation of an infix expression that is fully parenthesized using stack in java.
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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java is registered trademark of Oracle.
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