JAVA代码抽出通用的公共方法该怎么写,别的类调用
int[] arr = {2, 3, 4};
int a1, b2, c3;
Random random = new Random();
// 随机生成三个不重复的索引
int index1 = random.nextInt(arr.length);
int index2;
do {
index2 = random.nextInt(arr.length);
} while (index2 == index1);
int index3;
do {
index3 = random.nextInt(arr.length);
} while (index3 == index1 || index3 == index2);
// 将对应索引的值赋给变量
a1 = arr[index1];
b2 = arr[index2];
c3 = arr[index3];