如何在Java中设置数组？

Question

Here is my code:

int setElement(int[]array) {
  int key;
  for (int i=0; i<array.length; i++) {

  }
  return key;
}

Something is wrong here.

Answer 1

As you said, your method needs to take three parameters, but your method takes just one input array . Also there is no need to loop through the array , array element can be accessed using its index for insertion , also for retrieval . Since the index is passed as parameter you can use it directly in your code.

All you need to do is

public void setValueInArray(int[] array, int index, int value){
  if(array != null && index >= 0 && index < array.length){
     array[index] = value;
  }
}

Answer 2

Try to pass the index and the value you are trying to change.

  public void setElement(int[] array, int index, int val ) {
       if(array!=null && index >-1 && index<array.length ){
          array[index]=val ;
     }  else{
             //sorry not possible
           }
    } 

Answer 3

key should be passed to the method.

The way you're doing it you'll never meet the if condition since key has a garbage value - It's only declared but never defined.

Answer 4

Integer myArray[]= {12,23,10,22,10};
System.out.println(Arrays.asList(myArray).indexOf(23));

use above code