Dice Rolling java program

You should use a while loop: The dice are rolled again and again until the player has won or lost (then, break ends the while loop).

while (true) {
    int dice1=(int)(Math.random()*6+1);
    int dice2=(int)(Math.random()*6+1);
    int sum = dice1 + dice2;

    System.out.println("Roll: total = " + sum); 

    if (sum==2 || sum==3 || sum==12) {
        System.out.println("Sorry with a " + sum + " You LOSE :(");
        break;
    } else if(sum==7 || sum==11) { 
        System.out.println("Woah!!! With a " + sum + " You WIN!!!!!!!");
        break; 
    }

    // If you wanted, you could wait here for the user to confirm (e.g. with a key press)
}