面向对象综合训练

package com.itheima.loopdemo;

import java.util.Random;

public class Role {
    private String name;
    private int blood;

    public Role() {
    }

    public Role(String name, int blood) {
        this.name = name;
        this.blood = blood;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getBlood() {
        return blood;
    }

    public void setBlood(int blood) {
        this.blood = blood;
    }

    public void attack(Role role) {
        Random r = new Random();
        int hurt = r.nextInt(20) + 1;
        int remainBoold = role.getBlood() - hurt;
        remainBoold = remainBoold < 0 ? 0 : remainBoold;
        role.setBlood(remainBoold);
        System.out.println(this.getName() + "举起了拳头,打了" + role.getName() + "一下" + "造成了" + hurt + "点伤害," + role.getName() + "还剩下" + remainBoold + "点血");
    }
}

package com.itheima.loopdemo;

public class GameTest {
    public static void main(String[] args) {
        Role r1 = new Role("乔峰", 100);
        Role r2 = new Role("鸠摩智", 100);
        while (true) {
            r1.attack(r2);
            if (r2.getBlood() == 0) {
                System.out.println(r1.getName() + "K.O了" + r2.getName());
                break;
            }
            r2.attack(r1);
            if (r1.getBlood() == 0) {
                System.out.println(r2.getName() + "K.O了" + r1.getName());
                break;
            }
        }
    }
}

API&字符串

String

package com.itheima.loopdemo;

import java.util.Scanner;

public class StringDemo {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入一个字符串");
        String str = sc.next();
        int bigCount = 0;
        int smallCount = 0;
        int numberCount = 0;
        for (int i = 0; i < str.length(); i++) {
            char c = str.charAt(i);
            System.out.println(c);
            if (c >= 'a' && c <= 'z') {
                smallCount++;
            } else if (c >= 'A' && c <= 'Z') {
                bigCount++;
            } else if (c >= '0' && c <= '9') {
                numberCount++;
            }
        }
        System.out.println("小写字母的数量为:" + smallCount);
        System.out.println("大写字母的数量为:" + bigCount);
        System.out.println("数字的数量为:" + numberCount);
    }
}

两个代码我融合为了一个代码

package com.itheima.loopdemo;

public class StringDemo {
    public static void main(String[] args) {
        String result = reverser("abc");
        System.out.println(result);
    }

    public static String reverser(String str) {
        String result = "";
        for (int i = str.length() - 1; i >= 0; i--) {
            char c = str.charAt(i);
            result = result + c;
        }
        return result;
    }
}