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ArrayListMethods1.java
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101 lines (61 loc) · 2.22 KB
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package day28_ArrayList;
import java.util.ArrayList;
public class ArrayListMethods1 {
public static void main(String[] args) {
ArrayList<Integer> numbers = new ArrayList<>();
numbers.add(10); //0
numbers.add(20); //1
numbers.add(30); //3
numbers.add(40); //4
numbers.add(50); //6
numbers.add(60); //7
numbers.add(2, 25); //2
numbers.add(5, 45); //5
System.out.println(numbers);
System.out.println( numbers.size() );
int lastIndex = numbers.size() - 1;
System.out.println("lastIndex = " + lastIndex);
int num = numbers.get(3);
System.out.println("num = " + num);
System.out.println("------------------------------------");
for (int i = 0; i < numbers.size(); i++) {
System.out.println( numbers.get(i) );
}
System.out.println("----------------------------------");
ArrayList<String> list = new ArrayList<>();
list.add("Java");
list.add("Python");
list.add("Java");
list.add("C#");
list.add("Ruby");
list.set(2, "JavaScript"); // replace
list.set(3, "C++");
System.out.println(list);
System.out.println("----------------------------------");
ArrayList<String> employees = new ArrayList<>();
employees.add("Suat");
employees.add("Aygun");
employees.add("Olga");
employees.add("Neira");
employees.add("Ali");
employees.add("Hulya");
employees.add("Kaloyan");
System.out.println(employees);
employees.remove(0);
System.out.println(employees);
employees.remove(0);
System.out.println(employees);
employees.remove(0);
System.out.println(employees);
employees.remove(1);
System.out.println(employees);
employees.remove( employees.size() -1 );
System.out.println(employees);
boolean r1 = employees.remove("Hulya");
System.out.println(employees);
boolean r2 = employees.remove("Neira");
System.out.println(employees);
System.out.println("r1 = " + r1);
System.out.println("r2 = " + r2);
}
}