Java Arrays & Loops

Hi guys, I'm having a bit of trouble with the basics, I need to generate four unique numbers between 1 and 10 for each line. It all works fine except i cant work out how to check if the number is unique??

Code:

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linesArray = new int[lines][4];   
Random diceRoller = new Random();     

 //for each of the lines requested       
for(int i = 0; i < lines; i++) {         

 //for each number in the line           
int j = 0;           
while(j < 4){               

//generate a random number               
int roll = diceRoller.nextInt(10) + 1;               
if(linesArray[i][0] == roll || linesArray[i][1] == roll || linesArray[i][2] == roll || linesArray[i][3] == roll) {                   
return;               
} else {                   
linesArray[i][j] = roll;                   
j++;               
}           
}       
}

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thanks in advance for any help you can give!Adam

Store the ten numbers [1 ... 10] in a Collection, call Collections.shuffle( ... ) and get the first four numbers of that Collections.

kind regards,

Jos

Got it sorted, thanks so much for your help.