Java PTA上机测试题目小结之程序填空题

1.求解圆柱体的体积

//求解圆柱体的体积
import java.util.Scanner;
class Circle 
{
      private double radius;
      public Circle(double radius) {this.radius = radius;}
      public double getRadius() {
        【return radius】 (2分);
      }
      public void setRadius(double radius) {
        【this.radius = radius】(2分);
      }
      public double getArea() {return 
        【Math.PI * radius * radius】(2分) ;
      }
}
class Cylinder 【extends】(2分)  Circle
{
   double height =100;
   public Cylinder(double radius,double height) {super(radius); this.height = height ;}
   public double getVolumn() {
   return getArea()  * height;
  }
}
public class Main{
  public static void main(String[] args) {
       Scanner sc = new Scanner(System.in);
       double height = sc.nextDouble();
       double radius = sc.nextDouble();
       Cylinder obj = new Cylinder(radius, height);
       System.out.printf("Cylinder obj Volumn is %.2f",【obj.getVolumn()】(2分) );
  }
}

2.这是程序填空题模板。题目要求写在这里。
有一张足够大的纸，厚0.01 毫米。问将它对折多少次后可以达到珠穆朗玛峰的高度(8848.43米)。

class FoldCount {
       public int getCount(double h)  {
         int n =0 ;
          while(h<8848.43)  {               
            【h = h * 2】(2分);             
            【n++】(2分);
           }

        【return n】(2分);
     }
}
public class Main {
      public static void main(String[] args)  {
           FoldCount obj;
           obj = 【new FoldCount()】(2分);
           System.out.println(“count=” +【obj.getCount(0.00001)】(2分)) ;
       }
   }
}

3.

public class Main {
      public static void main(String[] args) {
        // Prompt the user to enter a password
        java.util.Scanner input = new java.util.Scanner(System.in);
        //System.out.print("Enter a string for password: ");
        String s = input.nextLine();
        if (【isValidPassword(s)】(3分)) {
          System.out.println("Valid password");
        }
        else {
          System.out.println("Invalid password");
        }
      }
      /** Check if a string is a valid password */
      public static boolean isValidPassword(String s) {
        // Only letters and digits?
        for (int i = 0; i < s.length(); i++) {
          if (【!Character.isLetter(s.charAt(i))】(3分)) && 
              !Character.isDigit(s.charAt(i)))
            return false;
        }

        // Check length
        if (【s.length()】(2分) < 8)
          return false;

        // Count the number of digits
        int count = 0;
        for (int i = 0; i < s.length(); i++) {
          if (【Character.isDigit(s.charAt(i))】(2分))
            count++;
        }

        if (count >= 2)
          return true;
        else 
          return false;
      }
    }

4.这是程序填空题模板。题目要求写在这里。例如：本题目要求打印“Hello World!”。

相同的数组。如果两个数组list1和list2的内容相同，那么就说它们是相同的。使用下面的程序可以判断两个数组是否相同，请填空补全程序。

import java.util.*;
public class Main {
   public static void main(String[] args) {
      Scanner input = new Scanner(System.in);
      int size1 = input.nextInt();
      int[] list1 = new int[size1];
      // Enter values for list1
      for (int i = 0; i < list1.length; i++)
         list1[i] = input.nextInt();
      int size2 = input.nextInt();
      int[] list2 = new int[size2];
      // Enter values for list2
      for (int i = 0; i < list2.length; i++)
         list2[i] = input.nextInt();
      input.close();
      if (【equals(list1, list2)】(4分)) {
         System.out.println("Two lists are identical");
      } else {
         System.out.println("Two lists are not identical");
      }
   }
   public static boolean equals(int[] list1, int[] list2) {
      if (【list1.length != list2.length】(3分))
         return false;
      Arrays.sort(list1);

     【Arrays.sort(list2)】(3分);
      for (int i = 0; i < list1.length; i++)
         if (list1[i] != list2[i])
            return false;
      return true;
   }
}