求解

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]));

谁能帮忙解释下这段代码的意思