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class Try{
 
	public static void main(String args[]){
		int[] collection = new int[6];
 
		collection[0] = 8;
		collection[1] = 2;
		collection[2] = 4;
		collection[3] = 2;
		collection[4] = 21;
		collection[5] = 3;
 
		Random rnd = new Random();
		int[] result = new int[4];
		boolean exist = false;
 
		int r, temp;
		r = rnd.get( 5 );
		System.out.println("r = "+r); 
 
		//losowanie indeksu do tablicy collection[]
 		temp = collection[r];
 
		for(int i = 0; i<6; i++)
		{
			//sprawdzanie czy tej wartosci juz nie ma w tablicy result
			if(temp == result[i]){
				exist = true;
				r = rnd.get( 5 );
				break;
			}
		}
		if(exist == false){
			result[i] = temp;
			r = rnd.get( 5 );
	}
 
 
	}
 }

Main.java:13: error: cannot find symbol
		Random rnd = new Random();
		^
  symbol:   class Random
  location: class Try
Main.java:13: error: cannot find symbol
		Random rnd = new Random();
		                 ^
  symbol:   class Random
  location: class Try
Main.java:34: error: cannot find symbol
			result[i] = temp;
			       ^
  symbol:   variable i
  location: class Try
3 errors

Standard output is empty