Homework 1113

homework/counts.java

@@ -0,0 +1,30 @@
+public class counts{
+    public static void main(String[] args){
+     int [] numbers = new int[100];
+     int [] counts = new int[10];
+
+   for(int i = 0; i<numbers.length; i++){
+            numbers[i] = (int)(Math.random()*10);
+            System.out.print(numbers[i]);       
+    }
+     System.out.print("\n"); 
+       System.out.println("each numbers is occur: \n");   
+
+           int count = 0;
+           for(int k =0; k< counts.length;k++) {
+             for(int i = 0; i<numbers.length; i++){
+              if(k == numbers[i])
+              count++;
+            }
+             counts[k] = count;
+             count = 0;
+       }      
+
+         for(int k = 0; k< counts.length; k ++)
+      System.out.println(k + ":"+counts[k]);
+
+
+}
+}
+
+

homework/printMatrix.java

@@ -0,0 +1,23 @@
+import java.util.Scanner;
+public class printMatrix{
+    public static void main(String[] args){
+    Scanner scan = new Scanner(System.in);
+    System.out.println("������һ������n");
+    int n = scan . nextInt();
+    printMatrix(n);
+ }
+     public static void printMatrix(int n ){
+       int i , j;
+     for(i =0; i< n ; i++){
+      for(j=0;j< n;j++){
+              int a = (int)((Math.random()*15)/10);
+             System.out.print(a); 
+       }
+             System.out.print("\n"); 
+     }
+}
+
+
+
+
+}

homework/reverse.java

@@ -0,0 +1,24 @@
+import java.util.Scanner;
+public class reverse{
+    public static void main(String[] args){
+    Scanner scan = new Scanner(System.in);
+    System.out.println("������һ������");
+    int number = scan . nextInt();
+    reverse(number);
+ }
+    public static void reverse(int number){
+      int a = 0;
+      if(number< 0 ){
+      System.out.println("�Ƿ�����!");
+    } 
+      else{
+        while(number > 0){
+          a = number % 10;
+          number = number/ 10;
+          System.out.print( a );
+    }
+
+ }      
+
+  }
+}

homework/sumMatrix.java

@@ -0,0 +1,31 @@
+import java.util.Scanner;
+public class sumMatrix{
+public static void main(String[] args){
+   System.out.println("import:");
+  Scanner scan = new Scanner(System.in);
+  int n = scan.nextInt();
+   double[][] matrix = new double[n][n];
+   for(int i = 0;i<matrix.length ; i++){
+    for(int j = 0; j < matrix[i].length; j++){
+   matrix[i][j] = (int)(Math.random()* 100);
+    System.out.print(matrix[i][j]+" ");
+    }
+    System.out.print("\n");
+}
+System.out.println("sum of these elements is:");
+   double sum = 0;
+   for(  int i = 0; i < matrix.length;i++){
+   for(int j = 0; j < matrix[i].length;j++){
+   if (i == j){
+    double elem = matrix[i][j];
+    sum = sum + elem;
+
+    }
+    }
+
+  }
+System.out.println(sum );
+
+ }
+
+ }

homework/temp.java

@@ -0,0 +1,30 @@
+import java.util .Scanner; 
+public class temp{
+public static void main(String[] args){
+  System.out.println("������10������");
+  Scanner scan = new  Scanner(System.in);
+ double[ ] array = new double[10];
+  for(int i = 0 ; i<10 ; i++) {
+    double n = scan.nextDouble();
+    array[i] = n;
+     }
+      for(int i = 0; i< array.length;i++){
+     System.out.print(array[i]+ " ");
+      }
+     System.out.println( indexOfSmallestElement(array));
+}
+
+    public static int indexOfSmallestElement(double [] array){
+    double min = array[0];
+   int index = 0;
+   for(int i = 0; i< array.length;i++){
+   if(array[i]< min){
+     min = array[i];
+     index = i;
+     }
+
+
+   }
+    return index;
+  }
+}

homework1105/Account.java

@@ -0,0 +1,73 @@
+import java.util.Date;
+   public class Account{
+
+public static void main(String[] args){
+    Account account = new Account(1,20000);
+   account.setannualInterestRate (4.5);
+ account.Withdrawl(2000);
+  account.Deposit(2000);
+
+  System.out.println("blance:" + account.getbalance() + "\n interest:"+account.getMonthlyInterest()+"\ndate" +account.getdateCreated() );
+
+}
+    private int id=0;
+    private double balance=0;
+   private double annualInterestRate = 0;
+    private Date dateCreated;
+   public Account(){
+    this.dateCreated = new Date(); 
+}//����Ĭ���˻����޲ι��췽�� 
+  public Account(int id, double balance){
+//����ָ��id���ʼ����˻��Ĺ��췽��
+   this.id = id;
+   this. balance = balance;    
+   this.dateCreated = new Date(); 
+   }
+//�������Լ��޸���
+    public int getid(){
+      return id;
+   }
+   public void setid(int newid){
+     this.id = newid;
+   }
+   public double getbalance(){
+      return balance;
+   }
+   public void setbalance(double newbalance){
+     this.balance = newbalance;
+   }
+public double getannualInterestRate(){
+      return annualInterestRate;
+   }
+   public void setannualInterestRate(double annualInterestRate){
+     this.annualInterestRate = annualInterestRate;
+   }
+//dateCreated�ķ���������
+ public Date getdateCreated(){
+   return dateCreated;
+}
+  public double getMonthlyInterestRate(){
+    double i = annualInterestRate/12;
+     return i;
+}
+  public double getMonthlyInterest(){
+    double i = balance *(annualInterestRate/12)/100;
+  return i ;
+
+   }
+
+public void Withdrawl(double money){
+  if(money > balance)
+  balance = balance - money;
+else
+  System.out.println("you donnot have enough money");    
+}
+public void Deposit(double money){
+  balance += money;
+}
+
+
+
+
+
+}

homework1105/arraysort.java

@@ -0,0 +1,39 @@
+import java.util.ArrayList;
+import java.math.*;
+public class arraysort{
+   public static void main(String[] args){
+    ArrayList<Number> list = new ArrayList<>();
+    list.add(3);
+   list.add(9);
+    list.add(5);
+    list.add(7);
+     list.add(1);
+  sort(list);
+
+}
+
+public static void sort(ArrayList<Number>list){
+   for(int i = 0;i < list.size();i++){
+     Number min = list.get(i);
+     int minindex = i;
+
+  for(int j = i+1;j<list.size();j++){
+   if(min.intValue() > list.get(j).intValue()){
+       min = list.get(j);
+      minindex = j;
+     }
+    }
+
+   if(minindex != i){
+    list.set(minindex,list.get(i));
+    list.set(i,min);
+   }
+
+   }
+ for (int a =0; a < list.size();a++){
+    System.out.print(list.get(a) + "");
+   }
+}
+
+
+}

homework1105/clone.java

@@ -0,0 +1,57 @@
+import java.util.ArrayList;
+import java.math.*;
+public class clone{
+public static void main(String[] args){
+     courseclone course1 = new courseclone("data structures");
+     courseclone course2 = (courseclone) course1.clone();
+   course1.addStudent("S1");
+  course1.addStudent("S2");
+  course1.addStudent("S3");
+  course2.addStudent("S4");
+  course2.addStudent("S5");
+   System.out.println(course1.getNumberOfStudents());
+     System.out.println(course2.getNumberOfStudents());
+
+}
+}
+ class courseclone implements Cloneable{
+     private String courseName;
+     private String[] students = new String[100];
+    private int numberOfStudents;
+
+     public courseclone(String courseName){
+      this.courseName = courseName;
+  }
+    public void addStudent(String student){
+        students[numberOfStudents] = student;
+        numberOfStudents++;
+  }
+    public String[] getStudents(){
+      return students;
+ }
+    public int getNumberOfStudents(){
+    return numberOfStudents;
+ }
+    public String getCourseName(){
+        return courseName;
+ }
+
+@Override
+public Object clone(){
+     try{
+        courseclone c = (courseclone)super.clone();
+        c.students = new String[100];
+
+
+    return  c;
+
+   }catch(CloneNotSupportedException ex){
+         return null;
+   }
+}
+
+}
+
+
+
+

homework1105/testdate.java

@@ -0,0 +1,13 @@
+import java.util.Date;
+public class testdate{
+     public static void main(String[] args){
+           long time = 10000;
+           Date date = new Date(time);
+
+       for(int i = 0;i<7;i++){
+            time = time* 10;
+           date.setTime(time);
+          System.out.println("when the elapsetime is:"+ time + "the date is: " + date.toString());
+    }
+  }
+}