Help: Program not doing what it's supposed to

[nevets04]

import java.util.*;
import java.lang.*;
class sub
{
	public static void main(String[] args)
	{
		String a = "1";
		String b = "2";
		String c = "3";
		String d = "4";
		String e = "5";
		String f = "6";
		String g = "7";
		Scanner sa1 = new Scanner(System.in);
		System.out.println("1) Encrypt");
		System.out.println("2) Encrypt");
		System.out.print("What do you want to do?: ");
		int ia1 = sa1.nextInt();
		if (ia1 == 1)
		{
			Scanner sa2 = new Scanner(System.in);
			System.out.print("What do you want to encrypt?: ");
			String ia2 = sa2.next();
			int ia2len = ia2.length();
			int cero = -1;			
			for (int loop = 0; loop < ia2len; loop++)
			{
				int cero1 = cero + 1;
				int cero2 = cero + 2;
				if (ia2.substring(cero1,cero2) == "a")
					System.out.print(a);
				else if (ia2.substring(cero1,cero2) == "b")
					System.out.print(b);
				else if (ia2.substring(cero1,cero2) == "c")
					System.out.print(c);
				else if (ia2.substring(cero1,cero2) == "d")
					System.out.print(d);
				else if (ia2.substring(cero1,cero2) == "e")
					System.out.print(e);
				else if (ia2.substring(cero1,cero2) == "f")
					System.out.print(f);
				else
					System.out.print("no");
				System.out.println();
		
			}
		}	
	}
			
}

If I input 1, then I input a, it outputs "no"
I want it to output "1"
Does anyone see what is wrong?

[Um num num]

Looks like u got few unnecessary things there, what exactly is the program suppose do

[mahkris]

import java.lang.*;
import java.util.*;
class Sub
{
	public static void main(String[] args)
	{
		String a = "1";
		String b = "2";
		String c = "3";
		String d = "4";
		String e = "5";
		String f = "6";
		String g = "7";
		Scanner sa1 = new Scanner(System.in);
		System.out.println("1) Encrypt");
		System.out.println("2) Encrypt");
		System.out.print("What do you want to do?: ");
		int ia1 = sa1.nextInt();
		if (ia1 == 1)
		{
			Scanner sa2 = new Scanner(System.in);
			System.out.print("What do you want to encrypt?: ");
			String ia2 = sa2.next();
			int ia2len = ia2.length();
			int cero = -1;
			for (int loop = 0; loop < ia2len; loop++)
			{
				int cero1 = cero + 1;
				int cero2 = cero + 2;

				if (ia2.substring(cero1,cero2).equals("a"))
					System.out.print(a);
				else if (ia2.substring(cero1,cero2).equals("b"))
					System.out.print(b);
				else if (ia2.substring(cero1,cero2).equals("c"))
					System.out.print(c);
				else if (ia2.substring(cero1,cero2).equals("d"))
					System.out.print(d);
				else if (ia2.substring(cero1,cero2).equals("e"))
					System.out.print(e);
				else if (ia2.substring(cero1,cero2).equals("f"))
					System.out.print(f);
				else
					System.out.print("no");
				System.out.println();

			}
		}
	}

}

try the above code
use "equals()" method instead of "=="

gud time:
mahkris

[nevets04]

import java.lang.*;
import java.util.*;
class Sub
{
	public static void main(String[] args)
	{
		String a = "1";
		String b = "2";
		String c = "3";
		String d = "4";
		String e = "5";
		String f = "6";
		String g = "7";
		Scanner sa1 = new Scanner(System.in);
		System.out.println("1) Encrypt");
		System.out.println("2) Encrypt");
		System.out.print("What do you want to do?: ");
		int ia1 = sa1.nextInt();
		if (ia1 == 1)
		{
			Scanner sa2 = new Scanner(System.in);
			System.out.print("What do you want to encrypt?: ");
			String ia2 = sa2.next();
			int ia2len = ia2.length();
			int cero = -1;
			for (int loop = 0; loop < ia2len; loop++)
			{
				int cero1 = cero + 1;
				int cero2 = cero + 2;

				if (ia2.substring(cero1,cero2).equals("a"))
					System.out.print(a);
				else if (ia2.substring(cero1,cero2).equals("b"))
					System.out.print(b);
				else if (ia2.substring(cero1,cero2).equals("c"))
					System.out.print(c);
				else if (ia2.substring(cero1,cero2).equals("d"))
					System.out.print(d);
				else if (ia2.substring(cero1,cero2).equals("e"))
					System.out.print(e);
				else if (ia2.substring(cero1,cero2).equals("f"))
					System.out.print(f);
				else
					System.out.print("no");
				System.out.println();

			}
		}
	}

}

try the above code
use "equals()" method instead of "=="

gud time:
mahkris

This doesn't work either :(