import java.util.Scanner;
class IfTest 
{
  public static void main(String[] args) 
  {
    System.out.println("请输入一个数值：例如：2！");
    Scanner s=new Scanner(System.in);
    int week = s.nextInt();
    if(week == 1)   
      System.out.println(week+"对应的是星期一");   
    else if(week == 2)    
      System.out.println(week+"对应的是星期二");   
    else if(week == 3)
      System.out.println(week+"对应的是星期三");   
    else if(week == 4)    
      System.out.println(week+"对应的是星期四");   
    else if(week == 5)    
      System.out.println(week+"对应的是星期五");   
    else if(week == 6)    
      System.out.println(week+"对应的是星期六");   
    else if(week == 7)
      System.out.println(week+"对应的是星期日");
    else
      System.out.println(week+"没有对应的星期");
  }
}

import java.util.Scanner;
class SwitchTest 
{
  public static void main(String[] args) 
  {
    System.out.println("请输入一个数值：例如：2！");
    Scanner s=new Scanner(System.in);
    int week = s.nextInt();
    switch(week)
    {
      case 1:
        System.out.println(week+"对应的是星期一");
        break;
      case 2:
        System.out.println(week+"对应的是星期二");
        break;
      case 3:
        System.out.println(week+"对应的是星期三");
        break;
      case 4:
        System.out.println(week+"对应的是星期四");
        break;
      case 5:
        System.out.println(week+"对应的是星期五");
        break;
      case 6:
        System.out.println(week+"对应的是星期六");
        break;
      case 7:
        System.out.println(week+"对应的是星期日");
        break;
      default:
        System.out.println(week+"没有对应的星期");
        break;
    }
  }
}

//1，定义变量。一个记录和，一个记录下一个数。
int i = 1;
int sum = 0;
//2，需要循环结构。
while(i<=10)
{
  //3，循环中需要进行和+下一个数的运算。并让下一个数自增。
  sum = sum + i;
  i++;
}
System.out.println("sum="+sum);

class ForTest 
{
  public static void main(String[] args) 
  {   
    //1，定义变量，记录个数。
    int count = 0;
    for (int x = 1; x<=100 ; x++ )
    {
      //对数值进行判断，是否是6的倍数。
      if(x % 6 == 0)
        count++;
    }
    System.out.println("count="+count);
  }
}

public class Text03 {
    public static void main(String[] args) {
        for(int i=1;i<=9;i++){
            for(int j=1;j<=i;j++){
                System.out.print(j+"*"+i+"="+i*j+"\t");
            }
            System.out.println();
        }
    }
}

        /**
         * 上半部分 等腰三角 空心
         * 下半部分 倒等腰三角 空心
         */
        for (int i =6 ;i>=1;i--){
            for (int j = 1;j<=11;j++){
                if(i==j||j==12-i){
                    System.out.print("*");
                }else {
                    System.out.print(" ");
                }
            }
            System.out.println();
        }
        for (int i = 2;i<=6;i++){
            for (int j = 1;j<=11;j++){
                if(i==j||j==12-i){
                    System.out.print("*");
                }else {
                    System.out.print(" ");
                }
            }
            System.out.println();
        }