Java Arrays & Loops

[AdamG]

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??

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++;                
}            
}        
}

thanks in advance for any help you can give!Adam

[JosAH]

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

kind regards,

Jos

[AdamG]

Got it sorted, thanks so much for your help.