VIP35/src/main/java/com/sf/day02/day02_2/Test.java

package com.sf.day02.day02_2;


import java.util.Scanner;

/**
 * java基础语法的补课内容
 */
public  class Test {

    @org.junit.Test
    public void t1(){
          byte a = 1;
          short b = 2;
          int c = 3;
          long d  =  4;


          float e = 5.0F;
//          float e = 5.0f;
          double f =6.0;

          char  str = 'a';   //a  = 97
        System.out.println(str);
        System.out.println(str+c);  //'A'+3  ==68    ’A‘ = 65
        char B = 'B';

        System.out.println((int) B);

        boolean flag = true;
        boolean flag2 = false;

             int aa =9;
             int bb =4;
//        System.out.println(aa/bb); ///2.25
        /**
         * i++  和  ++i   在没有变量接收的时候    效果等同  是都进行自加1
         * 有变量接收时     i++  先赋值后运算    ++i  先运算后赋值
         */
//        aa++;
//          ++aa;
        int cc = aa++;
        int dd = ++aa;
        System.out.println(aa);  //11
        System.out.println(cc);
        System.out.println(dd);

        short s = 3;   //初始化
//        s=s+2;
        s+=2;   //s=s+2

    }



    public void  eatFood(){
        int countTotal=100;
//        String   countTotal = "100";
//        countTotal = 200;


    }


    @org.junit.Test
    public void t3(){
//        int x = 1;
//        int y=1;
//        if(x++==2 & ++y==2){
//            x =7;
//        }
//        System.out.println("x="+x+",y="+y);//   x =    y =





//        int x = 1,y = 1;
//        if(x++==2 && ++y==2){
//            x =7;
//        }
//        System.out.println("x="+x+",y="+y);

//
//        int x = 1,y = 1;
//        if(x++==1 | ++y==1){
//            x =7;
//        }
//        System.out.println("x="+x+",y="+y);
//
//
//        int x = 1,y = 1;
//
//        if(x++==1 || ++y==1){
//            x =7;
//        }
//        System.out.println("x="+x+",y="+y);

      int a =  (3<4)?1:0;
        System.out.println(a);


    int aa  = 10;
    int bb  = 20;
   int max = (aa>bb)?aa:bb;
        System.out.println(max);
    }

    @org.junit.Test
    public void t5(){
/**
 * . 获取三个数中的较大数
 */

   int a = 10,b = 11,c = 20;
//       int max =  (a>b)?a:b;
//       c =  (a>c)?a:c;
//        System.out.println(c);
       int max =  (a>b)?a:b;
       int max1 =  (max>c)?max:c;
        System.out.println(max1);
    }

    /**
     * 获取4个数中的较大数
     *
     */

    @org.junit.Test
    public void t6(){

        Scanner scanner = new Scanner(System.in);
        System.out.println("从键盘输入1");
        //从键盘输入1  获取从键盘上输入的数据
        int nextInt = scanner.nextInt();
        System.out.println(nextInt);
    }

    public static void main(String[] args) {
//        Scanner scanner = new Scanner(System.in);
//        System.out.println("从键盘输入1");
//        //从键盘输入1  获取从键盘上输入的数据
//        int nextInt = scanner.nextInt();
//        System.out.println(nextInt);
        /**
         * **案例：**小明注册某交友网站，要求录入个人相关信息。如下：
         *
         * 请输入你的网名（String）、你的年龄（int）、你的体重（double）、你是否单身（an）、你的性别（int）等情况
         */
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入你的网名（String）");
        String name = scanner.next();
        System.out.println(name);
        System.out.println("你的年龄（int）");
        int age = scanner.nextInt();
        System.out.println(age);
        System.out.println("你的体重（double）");
        double nextDouble = scanner.nextDouble();
        System.out.println(nextDouble);
        System.out.println("你是否单身（an）");
        int nextInt = scanner.nextInt();
        if(nextInt == 1){
            System.out.println("单身");
        }else {
            System.out.println("不单身");
        }

        System.out.println("你的性别（int）");
        int sex = scanner.nextInt();
        if(sex ==1){
            System.out.println("nan");
        }else {
            System.out.println("nv");
        }

        System.out.println("录入完毕！");

    }

    @org.junit.Test
    public void t7(){
        /**
         * 获取一个随机数 [0,1)
         */
        double random = Math.random()+1;   //[1,2）
        System.out.println(random);

        /**
         * //[1,6]
         */

        for (int i = 0;i<20;i++){
            int v = (int) (Math.random() * 6) + 1;
            System.out.println(v);

        }
        //        double random2 = Math.random();
//        double random3 = Math.random();
//        double random4 = Math.random();
//        double random5 = Math.random();
//        double random6 = Math.random();
//        double random7= Math.random();
//        System.out.println(random);
//        System.out.println(random2);
//        System.out.println(random3);
//        System.out.println(random4);
//        System.out.println(random5);
//        System.out.println(random6);
//        System.out.println(random7);
    }
}