How to display random line from text file

for(int i=0;i<FullLineQues.length;i++){
    random.nextInt(i);
    Question=new String[6];
    Question=FullLineQues[i].split(",");                        
    commit=0;
    made=false;
    br=new BufferedReader(ir);
}

I want to random my line from text file, but it doesn't work