int N = 4;
int M = 3;

for (int i=0;i<N;i++) {
  System.out.println("I= "+i);

  for (int j=0;j<M;j++) {
    System.out.print("J="+j+" ");
  } // end inside loop

  System.out.println();
} // end outside loop

 
for(int i=0;i<4;i++)
{
   for(int j=0;j<4;j++)
    {
......                       
    }
}

 
import java.util.Scanner;
public class listProduct {
public static void main (String[] args){
 
	int productChoice;{
	Scanner scanAnything = new Scanner(System.in);
	System.out.print("Processed Milk");
	System.out.print("\t\t\t\t" + "Price");
	System.out.println("\t\t" + "grams/size");
	System.out.println("");
	System.out.println("Condensed");
	System.out.println("");
 
 
	Double[] price = new Double[100];
 
 
	price [1] = 46.30;
	price [2] = 52.10;
	String[] milk = new String [51];
	milk [0] ="0 - Alaska Filled Milk" + "\t\t\t" + "46.30" + "\t\t" + "300ml";
	milk [1] ="1 - Milkmaid Full Cream Milk " + "\t\t" + "52.10" + "\t\t" + "305ml";
 
	milk [2] ="2 - Alaska Filled Milk " + "\t\t\t" + "33.10" + "\t\t" + "370ml";
	milk [3] ="3 - Angel Filled Milk" + "\t\t\t" + "34.15" + "\t\t" + "410ml";
	milk [4] ="4 - Alpine Full Cream Milk " + "\t\t" + "44.30" + "\t\t" + "378ml";
 
	milk [5] ="5 - Alaska Filled Milk " + "\t\t\t" + "41.50" + "\t\t" + "150g";
	milk [6] ="6 - Bear Brand Filled Milk  " + "\t\t" + "51.00" + "\t\t" + "180g";
	milk [7] ="7 - Nido Fortified Full Cream Milk" + "\t" + "72.00" + "\t\t" + "150g";
 
	milk [8] ="8 - Blend 45" + "\t\t\t\t" + "14.60" + "\t\t" + "25g";
	milk [9] ="9 - Great Taste (granules)" + "\t\t" + "16.75" + "\t\t" + "25g";
 
 
 
		for (int r=0; r<=1; r++)
	System.out.println(milk [r] +"\t\t");
	System.out.println("");
	System.out.println("Evaporated");
	System.out.println("");
	for (int r=2; r<=4; r++)
		System.out.println(milk [r] +"\t\t");
 
	System.out.println("");
	System.out.println("Powdered");
	System.out.println("");
	for (int r=5; r<=7; r++)
		System.out.println(milk [r] +"\t\t");
 
	System.out.println("");
	System.out.println("Coffee-refill");
	System.out.println("");
	for (int r=8; r<=9; r++)
		System.out.println(milk [r] +"\t\t");
 
 
 
 
productChoice = scanAnything.nextInt(); // dont scan anything  ask the user to choose between 0 to 19 use switch case instead of so many if else or an array
if (productChoice == 0){
	System.out.println("Alaka Filled Milk is selected");
	System.out.println("Do you want to include more items?");
	System.out.println("1 - yes!");
	System.out.println("2 - no!");
 
 
	}else if(productChoice == 1){
	System.out.println("Milkmaid Full Cream Milk is selected");
	System.out.println("Do you want to include more items?");
	}else if(productChoice == 2){
	System.out.println("Alaska Filled Milk is selected");
	System.out.println("Do you want to include more items?");
	}else if(productChoice == 3){
		System.out.println("Angel Filled Milk is selected");
		System.out.println("Do you want to include more items?");
	}else if(productChoice == 4){
		System.out.println("Alphine Full Cream Milk is selected");
		System.out.println("Do you want to include more items?");
	}else if(productChoice == 5){
		System.out.println("Alaska Filled Milk is selected");
		System.out.println("Do you want to include more items?");
	}else if(productChoice == 6){
		System.out.println("Bear Brand Filled Milk is selected");
		System.out.println("Do you want to include more items?");
	}else if(productChoice == 7){
		System.out.println("Nido Fortified Full Cream Milk is selected");
		System.out.println("Do you want to include more items?");
	}else if(productChoice == 8){
		System.out.println("Bleand 45 is selected");
		System.out.println("Do you want to include more items?");
	}else if(productChoice == 9){
		System.out.println("Great Taste (granules) is selected");
		System.out.println("Do you want to include more items?");
	}else if(productChoice == 10){
		System.out.println("Nescafe Classic is selected");
		System.out.println("Do you want to include more items?");
	}else if(productChoice == 11){
		System.out.println("CDO Chinese Style luncheon meat is selected");
		System.out.println("Do you want to include more items?");
	}else if(productChoice == 12){
		System.out.println("Purefoods Chinese Style luncheon meat is selected");
		System.out.println("Do you want to include more items?");
	}else if(productChoice == 13){
		System.out.println("Argentina corned beef is selected");
		System.out.println("Do you want to include more items?");
	}else if(productChoice == 14){
		System.out.println("Argentina corned beef is selected");
		System.out.println("Do you want to include more items?");
	}else if(productChoice == 15){
		System.out.println("CDO corned beef is selected");
		System.out.println("Do you want to include more items?");
	}else if(productChoice == 16){
		System.out.println("Swift Juicy corned beef is selected");
		System.out.println("Do you want to include more items?");
	}else if(productChoice == 17){
		System.out.println("Purefoods corned beef is selected");
		System.out.println("Do you want to include more items?");
	}else if(productChoice == 18){
		System.out.println("Ligo corned beef is selected");
		System.out.println("Do you want to include more items?");
	}else if(productChoice == 19){
		System.out.println("Lucky Me instant noodles is selected");
		System.out.println("Do you want to include more items?");
	}else{
	System.out.println("No such item");
	System.out.println("Do you want to choose again?");
	System.exit(1);}
 
 
 
 
}
}
}

 
System.out.println("enter ur choice between 0 to 19");
//scan (productchoice)
swicth(productchoice)
{
case 0:
System.out.println("System.out.println("Alaka Filled Milk is selected");//add whatever u want here
break;
case 1:
....
break;