Java8 Programming Examples

Items1

java8

public class HelloWorld{

     public static void main(String []args){
        String o = "";
        z:
        for(int x = 0; x < 3; x++)
        {
            for(int y = 0; y < 2; y++)
            {
                if(x == 1)break;
                if(x==2 && y ==1)break z;
                o = o + x + y;
                System.out.println(o +" "+x+" "+y);
            }
        }
        System.out.println(o);
     }
}

PowerCalculator3

java8

/**
 * Performs unbounded integer exponentiation with a user-specified
 * base and exponent. This version uses dialog boxed for I/O.
 * 
 * @author Justin Yoder
 */
import java.util.Scanner;
import java.math.BigInteger;
import javax.swing.JOptionPane;

public class PowerCalculator3 {
 
     public static void main(String[] args) throws Exception{       
         
         // prompt the user and read input
         String prompt = "Enter two integers (base and exponent)";
         String input = JOptionPane.showInputDialog(prompt);
 
         // extract base and exponent from input string
         Scanner scan = new Scanner(System.in);
         BigInteger base = scanner.nextBigInteger();
         int exponent = scanner.nextInt();
         
         // format and display result
         BigInteger result = base.pow(exponent);
         String output = base + "^" + exponent + " = " + result;
         JOptionPane.showMessageDialog(nul, output);
         
    }
}

Number Format Demo

java8

import java.text.NumberFormat;
import java.math.BigInteger;

/**
 * Calculates 2^64 and outputs the result as a currency ammount with commas or
 * decimals to seperate thousands based on locale.
 *
 * @author Willy Ferreiras
 */

public class PowerCalculator{
    public static void main(String[] args){
       BigInteger two = new BigInteger("2");
       BigInteger num = two.pow(64).subtract(BigInteger.ONE); 
                                                /* line 14 subtracts 1 from result 
                                                of num instead of 64 because 
                                                BigInteger objects cannot be 
                                                changed once created */
       
       // Get a formatter for the current locale
       NumberFormat nf = NumberFormat.getInstance(); // recognizes current locale of user's machine
       
       // Display dollar amount
       String sym = nf.getCurrency().getSymbol();
       System.out.println(sym + nf.format(num));
       
    }
}

NumberFormatDemo

java8

import java.util.Scanner;
import java.math.BigInteger;
import java.text.NumberFormat;

/**
 * Calculates 2^64 and outputs the result as a dollar amount with commas 
 * to separate thousands. 
 *
 * @author Taylor Raker
 * @version September 18, 2017
 */
public class NumberFormatDemo {
    public static void main(String[ ] args) {
        BigInteger two = new BigInteger("2");
        BigInteger num = two.pow(64);
        
        // get formatter for the current locale
        NumberFormat nf = NumberFormat.getInstance();
        
        //display dollar amount
        String currencySymbol = nf.getCurrency().getSymbol();
        System.out.println(currencySymbol + nf.format(num));
    }    
}

Power Calculator 2- Section 1

java8

import java.util.Scanner;
import java.math.BigInteger;

/*
Performs unbounded integer exponention with a user-specified base and exponent.

@author Jake Nocentino
@version September 13, 2017
*/

public class PowerCalculator {
    public static void main(String[] args) {
        // prompt the user and read input
        System.out.print("Enter two integers (base and exponent): ");
        Scanner in = new Scanner(System.in);
       String baseString = in.next();
       int exp = in.nextInt();
        
        // calculate result
        BigInteger base = new BigInteger(baseString);
        BigInteger result = base.pow(exp);
        
        
        // format and display results
        String output = base + "^" + exp + " is " + result;
        System.out.println(output); 
    }
}

helloworld

java8

public class HelloWorld{

     public static void main(String []args){
        System.out.println("Hello World");
     }
}

Compile and Execute Java8 Online

java8

public class HelloWorld{

     public static void main(String []args){
        System.out.println("Hello World");
     }
}

Non Zero shift

java8

import java.io.*;
import java.util.*;

/*
 * Problem Statement : Shift all 0's to left in time complexity O(n)
 */

public class NonZeroShift {
  public static void main(String[] args) {
    int[] input = {6,4,0,5,0,0,1,6};

    System.out.println("Input array is : ");
    for (int i : input) {
      System.out.print(i+" ");
    }
    System.out.println();
    
       
    int[] output = sortNonZero(input);
    
    System.out.println("New array is : ");    
   for (int i : output) {
      System.out.print(i+" ");
    }
    
  }
  
  private static int[] sortNonZero(int[] input){
    int temp = -1;
    for(int i =input.length-1; i > -1; i--){
      if(input[i] == 0 && temp ==-1){
        temp = i;
      }else if (temp != -1 && input[i] != 0){
        int temp1 = input[temp];
        input[temp] = input[i];
        input[i] = temp1;
        temp--;
      }
  }
    return input;
  } 
}

Compile and Execute Java8 Online

java8

import java.util.*;

import java.lang.*;

import java.io.*;

/* Name of the class has to be "Main" only if the class is public. */
public class Squares
{
	public static void main (String[] args) throws java.lang.Exception
	{
    int i, j, n;
    String gmr;
    System.out.println("Please enter length " + "\n");
    Scanner sc = new Scanner(System.in);
    n = Integer.parseInt(sc.nextLine());

    for (j=0; j < n; j++) {
      for(i=0; i <n; i++){
         System.out.print("*");
      }
      System.out.println();
    }
	}
}

Java Practice

java8

public class HelloWorld{
    
    class Machine {
        public void machineFirst() {
       System.out.println("this is first overload");
        }
    }
    
    class Car extends Machine {
        public void machineFirst() {
    System.out.println("this is second overload");
        }
    }
    
    public class Manual {
    
    public static void main(String[] args) {
    
    Machine obj=new Machine();
    Car car= new Car();
    obj.machineFirst();
    car.machineFirst();
     }
    }

     
}

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