在Java中的随机抽样方法
您好
我的项目的数组在Java
我想在代码中使用随机数
怎么能行 /*
* This is the sorted class
*/
import java.util.*;
public class SortedArray
{
static Scanner key = new Scanner(System.in);
static int initialSize = 1;
static int[] array = new int[initialSize];
static int index = 1;
static int getElement;
static int delElement;
public static void getArrayElement()
{
try
{
if(initialSize==1)
{
//Get the user input
System.out.print("Enter the element: ");
getElement = key.nextInt();
//Assign the user input to the array
for(int i=0; i<index; i++)
{
array[i] = getElement;
}
}
//If the size of the array is not 1 use this
else
{
//Gets the user input
System.out.print("Enter the element: ");
getElement = key.nextInt();
//Create a new empty array with a new size
int[] temp = new int[index];
//Assign the old array into the new array
for(int j = 0; j < index-1; j++)
{
temp[j] = array[j];
}
//Change the size of the old array
array = new int [index];
//Assign the temporary array into the new array with its new size
for(int aSize = 0; aSize< array.length; aSize++)
{
array[aSize] = temp[aSize];
int k = array.length;
array[k-1] = getElement;
}
//Pass the array into sortArray method for sorting
sortArray(array, index);
}
//Increment the index and initialSize
index++;
initialSize++;
}
catch(InputMismatchException e)
{
System.out.println("Invalid Input");
System.exit(0);
}
}
//This is a bubble sort that sorts the array
public static void sortArray(int a[], int size)
{
for(int sortSize = 0; sortSize < size-1; sortSize++)
{
int temp_number;
for(int secondSize = (sortSize+1); secondSize < size; secondSize++)
{
if(a[sortSize] > a[secondSize])
{
temp_number = a[sortSize];
a[sortSize] = a[secondSize];
a[secondSize] = temp_number;
}
}
}
}
//Gets the sorted array
public static int[] getArray()
{
return array;
}
public static void printArray()
{
int getSize = 0;
//Outputs the sorted array
for(int get =0; get < getArray().length; get++)
{
int[] tempArray = getArray();
System.out.println(tempArray[get]);
getSize++;
}
System.out.print("Size: " + getSize + "\n");
}
//Empty the array
public static void clear()
{
index = 1;
initialSize = 1;
array = new int[initialSize];
System.out.println("The array is empty now");
}
/*
* This is the find method
* If the target is found then delete the target in the array
* else let the user know that target is not found
*/
public static void search(int dE)
{
int target = dE;
Boolean found = false;
for(int fValue = 0; fValue < array.length; fValue++)
{
if(array[fValue]==target)
{
for(int rElement = fValue; rElement < array.length-1; rElement++ )
{
array[rElement] = array[rElement+1];
}
int[] temp_Dele = new int[index-1];
for(int tempD = 0; tempD < index-1; tempD++)
{
temp_Dele[tempD] = array[tempD];
}
index--;
array = new int[temp_Dele.length-1];
for(int aDele = 0; aDele < array.length; aDele++)
{
array[aDele] = temp_Dele[aDele];
}
found = true;
}
}
if(!found)
{
System.out.println("Element Not Found");
}
}
//Delete the elements inside the array
public static void deleteArray()
{
System.out.print("Enter the element to be delete:");
delElement = key.nextInt();
search(delElement);
}
//Printing the the smallest element of the array
public static void smallest()
{
System.out.println(array[0]);
}
//Printing the largest element of the array
public static void largest()
{
int lastIndex = array.length;
//Printing the last element of the array
System.out.println(array[lastIndex-1]);
}
}