import java.util.Random;

public class BasicRandomExample {
    public static void main(String[] args) {
        Random random = new Random();
        
        // 生成0-99的隨機(jī)數(shù)
        int num1 = random.nextInt(100);
        
        // 生成10-30的隨機(jī)數(shù)
        int num2 = random.nextInt(21) + 10;
        
        System.out.println("0-99隨機(jī)數(shù): " + num1);
        System.out.println("10-30隨機(jī)數(shù): " + num2);
    }
}

import java.util.Random;

public class RandomCentGenerator {
    public static void main(String[] args) {
        String range = "0.1-0.3";
        int randomCent = getRandomCentInRange(range);
        System.out.println("隨機(jī)數(shù)（分）: " + randomCent);
    }

    public static int getRandomCentInRange(String range) {
        // 1. 分割字符串獲取最小值和最大值
        String[] parts = range.split("-");
        if (parts.length != 2) {
            throw new IllegalArgumentException("無(wú)效的范圍格式，請(qǐng)使用'min-max'格式");
        }

        try {
            // 2. 解析為元并轉(zhuǎn)換為分
            double minYuan = Double.parseDouble(parts[0]);
            double maxYuan = Double.parseDouble(parts[1]);
            
            int minCent = (int) Math.round(minYuan * 100);
            int maxCent = (int) Math.round(maxYuan * 100);
            
            // 3. 確保min <= max
            if (minCent > maxCent) {
                throw new IllegalArgumentException("最小值不能大于最大值");
            }
            
            // 4. 生成隨機(jī)數(shù)
            Random random = new Random();
            return random.nextInt(maxCent - minCent + 1) + minCent;
        } catch (NumberFormatException e) {
            throw new IllegalArgumentException("范圍值必須是有效的數(shù)字");
        }
    }
}

import java.util.Random;

public class HalfRangeRandom {
    public static void main(String[] args) {
        int number1 = 20;
        int random1 = getRandomAroundHalf(number1);
        System.out.println(number1 + " 的一半范圍隨機(jī)數(shù): " + random1);
        
        int number2 = 35;
        int random2 = getRandomAroundHalf(number2);
        System.out.println(number2 + " 的一半范圍隨機(jī)數(shù): " + random2);
    }

    public static int getRandomAroundHalf(int number) {
        // 1. 計(jì)算一半值（整數(shù)除法自動(dòng)向下取整）
        int half = number / 2;
        
        // 2. 確定范圍：half-5 到 half+5
        int min = half - 5;
        int max = half + 5;
        
        // 3. 確保最小值不小于0（可根據(jù)需求調(diào)整）
        min = Math.max(min, 0);
        
        // 4. 生成隨機(jī)數(shù)
        Random random = new Random();
        return random.nextInt(max - min + 1) + min;
    }
}

int half = (int) Math.round(number / 2.0);

import java.util.concurrent.ThreadLocalRandom;
int randomNum = ThreadLocalRandom.current().nextInt(min, max + 1);

public static int getRandomAroundHalf(int number, int offset) {
    int half = number / 2;
    int min = half - offset;
    int max = half + offset;
    // ...其余邏輯相同
}

public static double getRandomInRange(double min, double max) {
    return min + (Math.random() * (max - min));
}