3 Java Programs for Beginners

import java.util.*;

class NumberExample1 
{
    public static void main(String[] args) 
    {
        Scanner input=new Scanner(System.in);
        System.out.print("Enter Number1: ");
        int num1=input.nextInt();

        System.out.print("Enter Number2: ");
        int num2=input.nextInt();
        int sum=0;
        System.out.println("Number Square");
        for(int i=num1+1;i<num2;i++){
        System.out.println(i+"\t"+(i*i));
        sum+=(i*i);
        }
        System.out.println("Sum of squares: "+sum);

    }
}

import java.util.*;
class CharacterArray 
{
    public static void main(String[] args) 
    {
        Scanner input=new Scanner(System.in);
        System.out.print("Enter String: ");
        String st=input.nextLine();
        System.out.println("Characters of string: ");
        char ch[]=st.toCharArray();
        for(int i=0;i<ch.length;i++){
            System.out.println(ch[i]);
        }
    }
}

import java.io.*;

public class MultiplicationTable{
public static void main(String[] args) {
    try{
BufferedWriter bw=new BufferedWriter(new FileWriter("c:/table.txt",true));
int[][] array = new int[11][11];
for (int i=1; i<array.length; i++) {
for (int j=1; j<array[i].length; j++) {
array[i][j] = i*j;
System.out.print(" " + array[i][j]);
bw.write(" "+Integer.toString(array[i][j]));
}
System.out.println();
bw.newLine();
}
bw.close();
    }
    catch(Exception e){}
}
}