범위를 벗어난 Java Lang 색인에 대한 솔루션

import java.util.ArrayList;

public class TestArrayList {
  public static void main(String[] args) {
    ArrayList<String> list = new ArrayList<>();
    // we try to get value at index 0 which is
    // empty right now
    System.out.println(list.get(0));
    list.add("Mehvish"); // saves at index 0
    list.add("Ashiq"); // saves at index 1
  }
}

import java.util.ArrayList;

public class TestArrayList {
  // create array list object of String type
  static ArrayList<String> list = new ArrayList<>();

  // populate array list
  static void populateList() {
    list.add("Mehvish"); // saves at index 0
    list.add("Ashiq"); // saves at index 1
  }
  /*
  Access the index only if the index
  is valid and the list is not empty. Otherwise, print
  the message to inform the user
  */
  static void getElement(int index) {
    if (list.size() != 0 && index >= 0 && index < list.size()) {
      System.out.println(list.get(index));
    } else {
      System.out.println("The list is empty or you have entered an invalid index");
    }
  }
  // main method
  public static void main(String[] args) {
    populateList();
    getElement(0);
  }
}

Mehvish

Ashiq

The list is empty or you have entered an invalid index

The list is empty or you have entered an invalid index

The list is empty or you have entered an invalid index

public class TestArray {
  public static void main(String[] args) {
    int array[] = {1, 2, 3, 4, 5};
    for (int i = 0; i <= array.length; i++) System.out.println(array[i]);
  }
}

import java.util.ArrayList;

public class TestArray {
  // required size of an array
  static int size = 2;
  // declare an int type array of specified size
  static int array[] = new int[size];

  // populate array
  static void populateArray() {
    for (int i = 0; i < size; i++) array[i] = i + 1;
  }

  // get element if a valid index is passed
  static void getElement(int index) {
    if (array.length != 0 && index >= 0 && index < array.length) {
      System.out.println(array[index]);
    } else {
      System.out.println("The array is empty or you have entered an invalid index");
    }
  }

  // main method
  public static void main(String[] args) {
    populateArray();
    getElement(1);
  }
}

1

2

The array is empty or you have entered an invalid index

The array is empty or you have entered an invalid index

0