import java.util.Random;
int [] values={0,0,1,1,1,2,2,2,2,2};
int size=values.length;
Random rd=new Random();
int n=rd.nextInt(size-1);
System.out.println("SWITCH_VALUE? from inside:"+values[n]);
vars.put("SWITCH_VALUE",String.valueOf(values[n]));
誰能幫忙解釋下這段代碼的意思