Java第八次作业
- 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。
package ass; public class bs { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub int []a={10,20,30,40,50}; for (int i = 0; i < a.length; i++) { System.out.println(a[i]); } } }
2、将一个字符数组的值(neusofteducation)拷贝到另一个字符数组中。
package bsb; public class csc1 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub int a[]={1,2,3}; int newb[]=new int[a.length]; for (int i = 0; i < a.length; i++) { newb[i]=a[i]; } for (int i = 0; i < newb.length; i++) { System.out.print(" "+newb[i]); } } }
3、给定一个有9个整数(1,6,2,3,9,4,5,7,8)的数组,先排序,然后输出排序后的数组的值。
package bsb; public class csc1 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub int a[]={1,6,2,3,9,4,5,7,8}; for (int i = 0; i < a.length-1; i++) { for (int j = 0; j < a.length-1; j++) { if(a[j]>a[j+1]){ int s=a[j]; a[j]=a[j+1]; a[j+1]=s; } } } for (int i = 0; i < a.length; i++) { System.out.print(a[i]+" "); } } }
package bsb; import java.util.Arrays; public class csc1 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub int a[]={1,6,2,3,9,4,5,7,8}; Arrays.sort(a); for (int element:a) { System.out.print(element+" "); } } }
4、 输出一个double型二维数组(长度分别为5、4,值自己设定)的值.
package bsb; public class csc2 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub double [][]a=new double[3][4]; for (int i = 0; i < a.length; i++) { for (int j = 0; j < a[i].length; j++) { a[i][j]=i*1.2; } } System.out.println("矩阵是"); for (int i = 0; i < a.length; i++) { for (int j = 0; j < a[i].length; j++) { System.out.print(a[i][j]+" "); } System.out.println(); } } }
5、 在一个有8个整数(18,25,7,36,13,2,89,63)的数组中找出其中最大的数及其下标。
package bsb; public class csc2 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub int a[]={18,25,7,36,13,2,89,63}; if(a.length>0){ int max=a[0]; int aindex=0; for (int i = 0; i < a.length; i++) { if(a[i]>max){ max=a[i]; aindex=i; } } System.out.println("最大值是"+max+"下标是"+aindex); } } }
6,将一个数组中的元素逆序存放
public class j1 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub int []a=new int[5]; Scanner sc=new Scanner(System.in); System.out.println("输入数"); for (int i = 0; i < a.length; i++) { a[i]=sc.nextInt(); } int b[]=new int[5]; for (int i = 0; i < a.length; i++) { int a1=a[a.length-(i+1)]; b[i]=a1; System.out.print(b[i]+" "); } System.out.println(); }
7、将一个数组中的重复元素保留一个其他的清零。
package bss; import java.util.Scanner; public class j1 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub int []a=new int[5]; Scanner sc=new Scanner(System.in); System.out.println("输入数"); for (int i = 0; i < a.length; i++) { a[i]=sc.nextInt(); } for (int i = 0; i < a.length; i++) { for (int j = 0; j < a.length; j++) { if(a[i]==a[j]&&i!=j){ a[j]=0; } } } for (int i : a) { System.out.println(i); } } }
8、给定一维数组{ -10,2,3,246,-100,0,5},计算出数组中的平均值
package bss; public class j2 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub int []a={-10,2,3,246,-100,0,5}; double sum=0; for(double b:a){ sum+=b; } double avg=sum/a.length; System.out.println("平均数是"+avg); } }
9.使用数组存放裴波那契数列的前20项 ,并输出 1 1 2 3 5 8 13 21
package bss; public class j1 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub int []a=new int[20]; a[0]=1; a[1]=1; System.out.print(a[0]+" "+a[1]); for (int i = 2; i < a.length; i++) { a[i]=a[i-1]+a[i-2]; System.out.print(" "+a[i]); } } }
10.生成一个长度为10的随机整数数组(每个数都是0-100之间),输出,排序后,再输出
package bss; import java.util.Arrays; import java.util.Random; public class j1 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Random random=new Random(); int []a=new int[10]; for (int i = 0; i < a.length; i++) { a[i]=random.nextInt( 100)+1; } Arrays.sort(a); for (int i : a) { System.out.print(" "+i); } } }