Rava2 - Java Source Interpreter

/* retoor <retoor@molodetz.nl> */

import java.util.Arrays;
import java.util.Collections;
import java.util.ArrayList;

public class ArraysCollectionsUtil {
    public static void main(String[] args) {
        testArrays();
        testCollections();
    }

private static void testArrays() {
        System.out.println("=== Arrays ===");
        Object[] arr = new Object[5];
        Arrays.fill(arr, 1);
        System.out.println("Filled with 1: " + Arrays.toString(arr));
        
        arr[0] = 5;
        arr[1] = 2;
        arr[2] = 8;
        arr[3] = 1;
        arr[4] = 9;
        System.out.println("Before sort: " + Arrays.toString(arr));
        
        Arrays.sort(arr);
        System.out.println("After sort: " + Arrays.toString(arr));
        
        int idx = Arrays.binarySearch(arr, 8);
        System.out.println("Binary search for 8: " + idx);
        
        Object[] copy = Arrays.copyOf(arr, 3);
        System.out.println("Copy of length 3: " + Arrays.toString(copy));
    }

private static void testCollections() {
        System.out.println("\n=== Collections ===");
        ArrayList list = new ArrayList();
        list.add(5);
        list.add(2);
        list.add(8);
        list.add(1);
        list.add(9);
        
        System.out.println("Original list: " + listToString(list));
        
        Collections.sort(list);
        System.out.println("Sorted list: " + listToString(list));
        
        Collections.reverse(list);
        System.out.println("Reversed list: " + listToString(list));
        
        System.out.println("Max: " + Collections.max(list));
        System.out.println("Min: " + Collections.min(list));
        
        Collections.swap(list, 0, 4);
        System.out.println("Swapped 0 and 4: " + listToString(list));
        
        Collections.fill(list, 0);
        System.out.println("Filled with 0: " + listToString(list));
    }
    
    private static String listToString(ArrayList list) {
        String s = "[";
        for (int i = 0; i < list.size(); i++) {
            if (i > 0) s = s + ", ";
            s = s + list.get(i);
        }
        s = s + "]";
        return s;
    }
}

ready