帮我写一段代码，要求 用java实现随机生成保留两位小数的数字

Sure, here's some Java code that generates a random number with two decimal places:

import java.util.Random;

public class RandomNumberGenerator {

  public static void main(String[] args) {

    // Create new Random object
    Random rand = new Random();

    // Generate random number with two decimal places
    double num = rand.nextDouble() * 100;
    num = Math.round(num * 100.0) / 100.0;

    // Print out result
    System.out.println("Random number with two decimal places: " + num);

  }

}

This code uses the `Random` class in Java to generate a random number between 0 and 1. It then multiplies this number by 100 to get a number between 0 and 100, and rounds it to two decimal places using the `Math.round()` function.