java7

  1. 编写一个简单程序，要求数组长度为5，静态赋值10，20，30，40，50，在控制台输出该数组的值。

 

 1 package G;
 2 
 3 public class G1 {
 4 
 5     public static void main(String[] args) {
 6         // TODO Auto-generated method stub
 7         int[] a = new int[] { 10, 20, 30, 40, 50 };
 8         for (int i = 0; i < a.length; i++) {
 9             System.out.println(a[i]);
10         }
11     }
12 
13 }

编写一个简单程序，要求数组长度为5，动态赋值，并在控制台输出该数组的值。

 1 package G;
 2 
 3 import java.util.Scanner;
 4 
 5 public class G2 {
 6 
 7     public static void main(String[] args) {
 8         try (// TODO Auto-generated method stub
 9         Scanner input = new Scanner(System.in)) {
10             int a[]=new int[5];
11             for (int i = 0; i < a.length; i++) {
12                 a[i]=input.nextInt();      
13             }
14             for (int i = 0; i < a.length; i++) {
15                 System.out.println(a[i]);
16             }
17         }
18     }
19     }

3.定义字符型数组，分别存储c、h、 i、n、a 并在控制台输出

 1 package G;
 2 
 3 public class G3 {
 4 
 5     public static void main(String[] args) {
 6         char[] arr = new char[] { 'c', 'h', 'i', 'n', 'a' };
 7         for (char c : arr) {
 8             System.out.println(c);
 9         }
10 
11     }
12 
13 }

 1 package G;
 2 
 3 import java.util.Scanner;
 4 
 5 public class G4 {
 6 
 7     public static void main(String[] args) {
 8         try (// TODO Auto-generated method stub
 9         Scanner input = new Scanner(System.in)) {
10             int[]a=new int[5];
11             System.out.println("输入五个学生成绩");
12             int sum=0;
13             double pj=0;
14             for (int i = 0; i < a.length; i++) {
15                 a[i]=input.nextInt();
16             }
17             for (int i = 0; i < a.length; i++) {
18                 sum+=a[i];
19             }
20             pj=sum/5;
21             System.out.println("总分"+sum+"平均分"+pj);
22         }
23             }
24 
25         
26     }

5.定义数组{12,53,23,44,53} 用for和foreach分别输出，再倒序输出

 

 1 package G;
 2 
 3 public class G5 {
 4 
 5     public static void main(String[] args) {
 6         // TODO Auto-generated method stub
 7         int []a={12,53,23,44,53};
 8         for (int i = 0; i < a.length; i++) {
 9                System.out.println(a[i]);
10        }
11    System.out.println("--------------");
12 
13    for (int i : a) {
14        System.out.println(i);
15    }
16 
17    System.out.println("倒序");
18    for (int i=a.length-1; i>=0;i--) {
19        System.out.println(a[i]);
20    }
21        }
22    
23    
24     }

6.定义一个整型数组，赋值(动态静态都可以)后求出奇数个数和偶数个数

 1 package G;
 2 
 3 public class G6 {
 4 
 5     public static void main(String[] args) {
 6         // TODO Auto-generated method stub
 7         int a[]={11,22,33,44,55};
 8         int c=0;
 9         int b=0;
10         for (int i = 0; i < a.length; i++) {
11            if (a[i]%2==0) {
12                b++;
13                     }
14            if (a[i]%2!=0) {
15                c++;
16                 }
17            }
18         System.out.println("偶数个数为"+b);
19         System.out.println("奇数个数为"+c);
20    }
21 
22 
23 
24     }

定义一个整型数组，赋值后求出奇数个数和偶数个数

 1 package G;
 2 
 3 public class G7 {
 4 
 5     public static void main(String[] args) {
 6         // TODO Auto-generated method stub
 7         int[] array = {0, 1, 2, 3, 4, 5};
 8         int odd = 0;
 9         int even = 0;
10         for (int n : array) {
11             if (n % 2 != 0) {
12                 odd++;
13             }
14             else {
15                 even++;
16             }
17         }
18         System.out.println(odd);
19         System.out.println(even);
20     }
21 
22 
23     }

生成一个100长度数组，里面的数分别是1-100，并输出

 1 package G;
 2 
 3 public class G8 {
 4 
 5     public static void main(String[] args) {
 6         // TODO Auto-generated method stub
 7         int[] array = new int[100];
 8         for (int n = 0; n < 100; n++) {
 9             array[n] = n + 1;
10         }
11         
12         for (int n : array) {
13             System.out.println(n);
14         }
15     }
16 
17     }

 
 
posted @ 2021-04-20 18:55  计算机1905geng  阅读(267)  评论(0)  编辑  收藏  举报