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.
Knowledge Centre
Difference between while and do-while
The while statement verifies the condition before entering into the loop to see whether the next loop iteration should occur or not. The do-while statement executes the first iteration without checking the condition, it verifies the condition after finishing each iteration. The do-while statement will always execute the body of a loop at least once.
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-- William Arthur Ward

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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java is registered trademark of Oracle.
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