Java 程序计算数组重复项

编写一个 Java 程序来计算数组重复项，并附带示例或如何编写程序来查找和计算给定数组中的重复项。

在此重复数组数字示例中，我们使用 while 循环迭代 Dup_Count_arrr 数组，计算重复项（显示多次的项）并打印总数。请参阅 Java 教程。

package ArrayPrograms;

public class CountArrayDuplicates {
	
	public static void main(String[] args) {
		
		int i = 0, j, dup_count = 0;
		int[] Dup_Count_arr = {10, 15, 25, 10, 8, 12, 10, 15, 55, 10, 60};
		
		while(i < Dup_Count_arr.length) 
		{
			j = i + 1;
			while(j < Dup_Count_arr.length)
			{		
				if(Dup_Count_arr[i] == Dup_Count_arr[j]) {
					dup_count++;
					break;
				}
				j++;
			}
			i++;
		}
		System.out.println("\nThe Total Number of Duplicates  = " + dup_count);
	}
}

The Total Number of Duplicates  = 4

使用 For 循环计算数组中重复项的 Java 程序

package ArrayPrograms;

import java.util.Scanner;

public class CountArrayDuplicates1 {
	private static Scanner sc;
	
	public static void main(String[] args) {
		int Size, i, j, dup_count = 0;
		
		sc = new Scanner(System.in);
		
		System.out.print("\nPlease Enter the Duplicate Array size  : ");
		Size = sc.nextInt();
		
		int[] Dup_Count_arr = new int[Size];
		
		System.out.format("\nEnter Duplicate Array %d elements : ", Size);
		for(i = 0; i < Size; i++) 
		{
			Dup_Count_arr[i] = sc.nextInt();
		}
		
		for(i = 0; i < Size; i++) 
		{
			for(j = i + 1; j < Size; j++)
			{
				if(Dup_Count_arr[i] == Dup_Count_arr[j]) {
					dup_count++;
					break;
				}
			}
		}
		System.out.println("\nThe Total Number of Duplicates  = " + dup_count);
	}
}

在此 示例 中计算重复数组项，我们创建了一个单独的函数 CountDuplicateElement 来计算并返回重复计数。

package ArrayPrograms;

import java.util.Scanner;

public class CountArrayDuplicates2 {
	private static Scanner sc;
	
	public static void main(String[] args) {
		int Size, i;
		
		sc = new Scanner(System.in);
		
		System.out.print("\nPlease Enter the Duplicate Array size  : ");
		Size = sc.nextInt();
		
		int[] Dup_Count_arr = new int[Size];
		
		System.out.format("\nEnter Duplicate Array %d elements : ", Size);
		for(i = 0; i < Size; i++) 
		{
			Dup_Count_arr[i] = sc.nextInt();
		}
		
		int dup_count = CountDuplicateElement(Dup_Count_arr, Size);
		
		System.out.println("\nThe Total Number of Duplicates  = " + dup_count);
	}
	
	public static int CountDuplicateElement(int[] Dup_Count_arr, int Size ) {
		int i, j, dup_count = 0;
		
		for(i = 0; i < Size; i++) 
		{
			for(j = i + 1; j < Size; j++)
			{
				if(Dup_Count_arr[i] == Dup_Count_arr[j]) {
					dup_count++;
					break;
				}
			}
		}
		return dup_count;
	}
}

Please Enter the Duplicate Array size  : 11

Enter Duplicate Array 11 elements : 4 22 19 4 22 11 4 19 9 19 99

The Total Number of Duplicates  = 5