Java代码案例14——逻辑运算符判断闰年2

// Java逻辑运算符判断闰年
// 闰年：能被4整除并且不能被100整除，或者能被400整除
// 注意：并且&&的优先级高于或者||
package xiangmu;
public class Ceshi {
    public static void main(String args[]) {
        int nian = 2000;
        if(nian % 400 == 0 || nian % 4 == 0 && nian % 100 != 0 ) {
            dayin(nian + "是闰年");
        }else {
            dayin(nian + "不是闰年");
        }
    }
    public static void dayin(String zifuchuan) {
        System.out.println(zifuchuan);
    }
} 
2000是闰年

Java代码案例13——逻辑运算符判断闰年1

// Java逻辑运算符判断闰年
// 闰年：能被4整除并且不能被100整除，或者能被400整除
package xiangmu;
public class Ceshi {
    public static void main(String args[]) {
        int nian = 1900;
        if(nian % 4 == 0 && nian % 100 != 0 || nian % 400 == 0) {
            dayin(nian + "是闰年");
        }else {
            dayin(nian + "不是闰年");
        }
    }
    public static void dayin(String zifuchuan) {
        System.out.println(zifuchuan);
    }
} 
1900不是闰年

Java代码案例12——多分支成绩分级2

// Java多分支成绩分级，打乱判断条件的顺序，用并且&&连接多个条件
package xiangmu;
public class Ceshi {
    public static void main(String args[]) {
        int chengji = 85;
        if(chengji == 100) {
            dayin("满分");
        }else if(chengji >= 60 && chengji < 80) {
            dayin("及格");
        }else if(chengji >= 80 && chengji < 100) {
            dayin("优秀");
        }else {
            dayin("不及格");
        }
    }
    public static void dayin(String zifuchuan) {
        System.out.println(zifuchuan);
    }
} 
优秀

Java代码案例11——多分支成绩分级1

// Java多分支成绩分级，注意判断条件的顺序
package xiangmu;
public class Ceshi {
    public static void main(String args[]) {
        int chengji = 85;
        if(chengji == 100) {
            dayin("满分");
        }else if(chengji >= 80) {
            dayin("优秀");
        }else if(chengji >= 60) {
            dayin("及格");
        }else {
            dayin("不及格");
        }
    }
    public static void dayin(String zifuchuan) {
        System.out.println(zifuchuan);
    }
} 
优秀

Java代码案例10——多分支判断星期

// Java多分支判断星期
package xiangmu;
public class Ceshi {
    public static void main(String args[]) {
        int xingqi = 3;
        if(xingqi == 1) {
            dayin("星期一");
        }else if(xingqi == 2) {
            dayin("星期二");
        }else if(xingqi == 3) {
            dayin("星期三");
        }else if(xingqi == 4) {
            dayin("星期四");
        }else if(xingqi == 5) {
            dayin("星期五");
        }else {
            dayin("周末");
        }
    }
    public static void dayin(String zifuchuan) {
        System.out.println(zifuchuan);
    }
} 
星期三

Java代码案例9——比较运算

// Java比较运算
package xiangmu;
public class Ceshi {
    public static void main(String args[]) {
        int a = 5;
        if(a == 5) {
            dayin(a + "等于5");
        }
        if(a != 3) {
            dayin(a + "不等于3");
        }
        if(a > 1) {
            dayin(a + "大于1");
        }
        if(a >= 5) {
            dayin(a + "大于等于5");
        }
        if(a < 6) {
            dayin(a + "小于6");
        }
        if(a <= 5) {
            dayin(a + "小于等于5");
        }
    }
    public static void dayin(String zifuchuan) {
        System.out.println(zifuchuan);
    }
} 
5等于5
5不等于3
5大于1
5大于等于5
5小于6
5小于等于5

Java代码案例8——判断奇偶数

// Java判断奇偶数
package xiangmu;
import java.util.Scanner;
public class Ceshi {
    public static void main(String args[]) {
        Scanner sc = new Scanner(System.in);
        dayin("请输入一个正整数：");
        int shuzi = sc.nextInt();
        if(shuzi % 2 == 0) {
            dayin(shuzi+"是一个偶数");
        }else {
            dayin(shuzi+"是一个奇数");
        }
        sc.close();
    }
    public static void dayin(String zifuchuan) {
        System.out.print(zifuchuan);
    }
} 
请输入一个正整数：11
11是一个奇数

Java代码案例7——求长方体体积

// Java求长方体体积
package xiangmu;
import java.util.Scanner;
public class Ceshi {
    public static void main(String args[]) {
        Scanner sc = new Scanner(System.in);
        dayin("请输入长方体的长：");
        int ch = sc.nextInt();
        dayin("请输入长方体的宽：");
        int k = sc.nextInt();
        dayin("请输入长方体的高：");
        int g = sc.nextInt();
        int tiji = qiutiji(ch, k, g);
        dayin("这个长方体的体积为：" + tiji);
        sc.close();
    }
    public static int qiutiji(int chang, int kuan, int gao) {
        int t = chang * kuan * gao;
        return t;
    }
    public static void dayin(String zifuchuan) {
        System.out.print(zifuchuan);
    }
} 
请输入长方体的长：5
请输入长方体的宽：3
请输入长方体的高：4
这个长方体的体积为：60

Java代码案例6——求长方形面积

// Java求长方形面积
package xiangmu;
import java.util.Scanner;
public class Ceshi {
    public static void main(String args[]) {
        Scanner sc = new Scanner(System.in);
        dayin("请输入长方形的长：");
        int ch = sc.nextInt();
        dayin("请输入长方形的宽：");
        int k = sc.nextInt();
        int mianji = qiumianji(ch, k);
        dayin("这个长方形的面积为：" + mianji);
        sc.close();
    }
    public static int qiumianji(int chang, int kuan) {
        int m = chang * kuan;
        return m;
    }
    public static void dayin(String zifuchuan) {
        System.out.print(zifuchuan);
    }
} 
请输入长方形的长：5
请输入长方形的宽：3
这个长方形的面积为：15

Java代码案例5——静态方法（静态函数）

// Java静态方法（静态函数）
package xiangmu;
public class Ceshi {
    public static void main(String args[]) {
        dayin("你好");
    }
    public static void dayin(String zifuchuan) {
        System.out.print(zifuchuan);
    }
} 
你好

Java代码案例4——同时得到商和余数

// Java同时得到商和余数
package xiangmu;
import java.util.Scanner;
public class Ceshi {
    public static void main(String args[]) {
        Scanner sc = new Scanner(System.in);
        System.out.print("请输入第一个正整数：");
        int shuzi1 = sc.nextInt();
        System.out.print("请输入第二个正整数：");
        int shuzi2 = sc.nextInt();
        int shang = shuzi1 / shuzi2;
        int yushu = shuzi1 % shuzi2;
        System.out.println(shuzi1 + "/" + shuzi2 + "=" + shang + "..." + yushu);
        sc.close();
    }
} 
请输入第一个正整数：13
请输入第二个正整数：5
13/5=2...3

Java代码案例3——算术运算

// Java算术运算
package xiangmu;
import java.util.Scanner;
public class Ceshi {
    public static void main(String args[]) {
        Scanner sc = new Scanner(System.in);
        System.out.print("请输入第一个正整数：");
        int shuzi1 = sc.nextInt();
        System.out.print("请输入第二个正整数：");
        int shuzi2 = sc.nextInt();
        int jieguo1 = shuzi1 + shuzi2; // 加法 +
        System.out.println(shuzi1 + "+" + shuzi2 + "=" + jieguo1);
        int jieguo2 = shuzi1 - shuzi2; // 减法 -
        System.out.println(shuzi1 + "-" + shuzi2 + "=" + jieguo2);
        int jieguo3 = shuzi1 * shuzi2; // 乘法 *
        System.out.println(shuzi1 + "*" + shuzi2 + "=" + jieguo3);
        float jieguo4 = (float)shuzi1 / shuzi2; // 除法 /
        System.out.println(shuzi1 + "/" + shuzi2 + "=" + jieguo4);
        int jieguo5 = shuzi1 % shuzi2; // 求余数
        System.out.println(shuzi1 + "%" + shuzi2 + "=" + jieguo5);
        sc.close();
    }
} 
请输入第一个正整数：13
请输入第二个正整数：5
13+5=18
13-5=8
13*5=65
13/5=2.6
13%5=3

Java代码案例2——输入、存储、输出

// Java输入、存储、输出
package xiangmu;
import java.util.Scanner;
public class Ceshi {
    public static void main(String args[]) {
        System.out.print("请输入用户名：");
        Scanner sc = new Scanner(System.in);
        String yonghuming = sc.next();    // 变量
        System.out.print("你好，"+yonghuming);
        sc.close();
    }
} 
请输入用户名：张三
你好，张三

如何打开浏览器

本文以打开 Edge 浏览器为例。

1、电脑开机，进入系统，找到屏幕最下方任务栏上的【开始菜单】图标。

/images/11ab68a8ccf6d91685f806c4289eb8d.png

2、点击【开始菜单】图标，找到图中标红的【搜索框】，点击【搜索框】。

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