My Java code terminates

[DavidLacsao]

I need help because I don’t know why my code terminates after I enter a value using the Scanner method. Is there a problem with the syntax?. Please help.

here is the code:

import java.util.Scanner;

public class Objects {
	public static void main(String[] args) {
		
		Scanner console = new Scanner(System.in);
		
		int[] num1 = {3, 2, 7};
		
		int[][] num2 = {
				{2, 9, 0},
				{3, 1, 5},
		};
		String[][] thing = {
				{"Phone", "Pencil"},
				{"Eraser", "Mouse"},
				{"Paper", "tissue"},
		};
		
		int[] newNum1 = new int[2];
		int[][] newNum2 = new int[2][2];
		
		newNum1[0] = 5;
		newNum1[1] = 2;
		
		newNum2[0][0] = 21;
		newNum2[0][1] = 43;
		newNum2[1][0] = 27;
		newNum2[1][1] = 98;
		
		System.out.println("Which of the following do you want to access?");
		System.out.println("string or number?");
		System.out.print("Answer: ");
		String choice = console.next();
		
		if(choice == "string") {
			System.out.println("Which row do you want to access?");
			System.out.print("Choice: ");
			int a = console.nextInt();
			System.out.println("Which item do you want to access?");
			System.out.print("Choice: ");
			int b = console.nextInt();
			
			String result = thing[a][b];
			System.out.println("You have chosen the item: " + result);
		} else if(choice == "number") {
			System.out.println("What specific number do you want to access?");
			System.out.print("num1, num2, newNum1, or newNum2");
			String pick = console.next();
			
			if(pick == "num1") {
				System.out.println("This numbers has only 1 array");
				System.out.println("Which position do you want to pick?");
				int a = console.nextInt();
				
				int result = num1[a];
				System.out.println("The number chosen is: " + result);
			} else if(pick == "num2") {
				System.out.println("Row 1 or Row 2?");
				int a = console.nextInt();
				System.out.println("Which position?");
				int b = console.nextInt();
				
				int result = num2[a][b];
				System.out.println("The chosen number is: " + result);
			} else if(pick == "newNum1") {
				System.out.println("This numbers has only 1 array");
				System.out.println("Which position do you want to pick?");
				int a = console.nextInt();
				
				int result = num1[a];
				System.out.println("The number chosen is: " + result);
			} else if(pick == "newNum2") {
				System.out.println("Row 1 or Row 2?");
				int a = console.nextInt();
				System.out.println("Which position?");
				int b = console.nextInt();
				
				int result = num2[a][b];
				System.out.println("The chosen number is: " + result);
			} else {
				System.out.println("Invalid choice");
			}
		}
		
		
	}

}