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ArrayList_Tutorial.java
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package ArrayList;
import java.util.ArrayList;
import java.util.List;
public class ArrayList_Tutorial {
public static void main(String[] args) {
List<Integer> numberList = new ArrayList<>();
numberList.add(10);
numberList.add(20);
numberList.add(30);
numberList.add(40);
System.out.println(numberList);
System.out.println(findNumber(numberList, 30));
System.out.println(deleteNumber(numberList, 30));
System.out.println(numberList);
System.out.println(insertNumber(numberList, 40));
System.out.println(numberList);
}
// Accessing elements if statement // .get() // arraylist if.contains // object for if.equals
// arrayList.indexOf
public static boolean findNumber(List<Integer> numberList, int numb){
if (numberList.contains(numb)) {
return true;
}
return false;
}
public static boolean deleteNumber(List<Integer> numberList, int numb){
if (numberList.contains(numb)) {
numberList.remove(numberList.indexOf(numb));
return true;
}
return false;
}
private static boolean insertNumber(List<Integer> numberList, int numb) {
if (!(numberList.contains(numb))) {
numberList.add(numb);
return true;
}
return false;
}
}