打印数组中的每个数字及其重复的次数

Question

I have an array containing the below nos: 1,3,4,5,6,3,2,4,6,7,9,4,12,3,4,6,8,9,7,6,43,2,4,7,7,5,2,1,3,4,6,311,1 I need to print each number from the array and the times it has been repeated in the array. I am receiving an error while running the below program "i cannot be resolved to a variable".

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public class PrintNosandRepeatation {

    public static void main(String[] args) {

        int a[] = new int[] {1,3,4,5,6,3,2,4,6,7,9,4,12,3,4,6,8,9,7,6,43,2,4,7,7,5,2,1,3,4,6,311,1};
        for (int i=0; i< a.length; i++);
        System.out.println(a[i]);
    }
}

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Please let me know where i am going wrong..

Answer 1

Delete the ; after the if condition:

for (int i=0; i< a.length; i++);
                               ^------------- delete this

Why? Because it declares an empty statement, so the for body will be empty. Therefore when you try to use variable i , it is actually out of the block it was declared in (a block is delimited by { } ).

Answer 2

int a[]= {1,3,4,5,6,3,2,4,6,7,9,4,12,3,4,6,8,9,7,6,43,2,4,7,7,5,2,1,3,4,6,311,1};

    int i, j;
    System.out.println("Repeated Elements are :");
    for (i = 0; i < a.length; i++) {
        for (j = i + 1; j < a.length; j++) {
            if (a[i] == a[j])
                System.out.print(a[i] + " ");
        }
    }
}