第八次作业

课上练习:

1.

 package fdsa;

public class lj {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
         int []a;
           a=new int[]{10,20,30,40,50};
           for(int i=0;i<a.length;i++){
               System.out.println(a[i]);
           }
           
            }

        

    }

 

 2.

 package fdsa;

public class lj {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
         String string="neusofteducation";
       String a[]=new String[string.length()];
         for(int i=0;i<string.length();i++){
             a[i]=(String)string.subSequence(i, i+1);
         }
         for(String i:a){
                    System.out.println(i+" ");
             }
           System.out.println();
           
            }
    
}

 

 3.

 package fdsa;

public class lj {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
    int []a;
         a=new int[]{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-i-1; j++) {
                 if(a[j]>a[j+1]){
                     int x=a[j];
                     a[j]=a[j+1];
                     a[j+1]=x;
                 }
                
            }
               
             for(int z:a){
                 System.out.println(z+"");
             }
           }
           
            }

        

    }

 

 4.

 package fdsa;

public class lj {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
       double array[][]=new double[5][4];
         for(int i=0;i<array.length;i++){
             for (int j = 0; j < array[i].length; j++) {
                 array[i][j]=(i+1)*(j+4);
                    System.out.println(array[i][j]+"\t");
             }
           System.out.println();
           
            }
    }
}

 

 5.

package fdsa;

public class lj {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
       int a[]={18,25,7,36,13,2,89,63};
       int max=a[0];int c=0;
         for(int i=0;i<a.length;i++){
             if(a[i]>max){
                 max=a[i];
                 c=i;
                    System.out.println(max+"下标："+c);
             }
           
           
            }
    }
}

 

作业

6.

package fdsa;

public class lj {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
         String a[]={"1","2","3","4","5","6"};
       String b="";
         for(int i=0;i<a.length/2;i++){
             b=a[i];
             a[i]=a[a.length-i-1];
             a[a.length-i-1]=b;
         }
         for(String i:a){
                    System.out.println(i+" ");
             }
            }
    
}

 

 7.

package fdsa;

public class lj {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
         String a[]={"1","2","3","4","5","6"};
         for(int i=0;i<a.length/2;i++){
             for (int j = 0; j < i; j++) {
                if(a[i].equals(a[j])){
                    a[j]="0";
                }
            }
         }
         for(String i:a){
                    System.out.println(i+" ");
             }
            }
    
}

 

 8.

package fdsa;

public class lj {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
         int a[]={-10,2,3,246,-100,0,5};
         int max=0,min=0,sum=0;
         for(int i=0;i<a.length-1;i++){
             max=0;min=0;
             for (int j = 0; j < a.length; j++) {
                if(a[max]<a[j]){
                    max=j;
                    
                }
            }
         }
         for(int j=0;j<a.length;j++){
             sum+=a[j];
                    
             }
         System.out.println("最大值"+a[max]+"最小值"+a[min]+"平均值"+sum/a.length);
            }
    
}

 

 9.

package fdsa;

public class lj {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
int a[]=new int[20];a[0]=1;
        int x=1;
        int y=1;
        int z=1;
        for (int i = 1; i < a.length; i++) {
            a[i]=z;
            z=x+y;
            x=y;
            y=z;
        }
        for (int i = 0; i < a.length; i++) {
            System.out.println(a[i]);
        }
 
    }
 
}

 

 10.

package fdsa;
import java.util.Arrays;
import java.util.Random;
 
public class lj {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
Random r=new Random();
        int a[]=new int[10];
        for (int i = 0; i < a.length; i++) {
            a[i]=r.nextInt(100);
            System.out.println(a[i]);
        }
        System.out.println("排序");
        Arrays.sort(a);
        for(int i:a){
            System.out.print(i+",");
        }
 
    }
 
}