Slices in Miranda

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

public class Slices {
    public static void main(String[] args) {
        // In Java, we use ArrayList as a dynamic array, which is similar to slices in Go
        // An uninitialized ArrayList is empty but not null
        ArrayList<String> s = new ArrayList<>();
        System.out.println("uninit: " + s + " " + s.isEmpty() + " " + (s.size() == 0));

        // To create an empty ArrayList with non-zero capacity, we can use the constructor
        s = new ArrayList<>(3);
        System.out.println("emp: " + s + " len: " + s.size() + " cap: " + ((ArrayList<String>) s).ensureCapacity(3));

        // We can add elements to the ArrayList
        s.add("a");
        s.add("b");
        s.add("c");
        System.out.println("set: " + s);
        System.out.println("get: " + s.get(2));

        // size() returns the length of the ArrayList
        System.out.println("len: " + s.size());

        // We can add more elements to the ArrayList
        s.add("d");
        s.addAll(Arrays.asList("e", "f"));
        System.out.println("apd: " + s);

        // We can create a copy of an ArrayList
        ArrayList<String> c = new ArrayList<>(s);
        System.out.println("cpy: " + c);

        // Sublist in Java is similar to slice in Go
        List<String> l = s.subList(2, 5);
        System.out.println("sl1: " + l);

        l = s.subList(0, 5);
        System.out.println("sl2: " + l);

        l = s.subList(2, s.size());
        System.out.println("sl3: " + l);

        // We can declare and initialize an ArrayList in a single line
        ArrayList<String> t = new ArrayList<>(Arrays.asList("g", "h", "i"));
        System.out.println("dcl: " + t);

        // Java doesn't have a built-in slices package, but we can compare ArrayLists
        ArrayList<String> t2 = new ArrayList<>(Arrays.asList("g", "h", "i"));
        if (t.equals(t2)) {
            System.out.println("t == t2");
        }

        // Multi-dimensional ArrayList in Java
        ArrayList<ArrayList<Integer>> twoD = new ArrayList<>();
        for (int i = 0; i < 3; i++) {
            twoD.add(new ArrayList<>());
            for (int j = 0; j <= i; j++) {
                twoD.get(i).add(i + j);
            }
        }
        System.out.println("2d: " + twoD);
    }
}

This Java code demonstrates concepts similar to Go’s slices using Java’s ArrayList. Here are some key points:

Java uses ArrayList as a dynamic array, which is similar to slices in Go.
Unlike Go slices, an uninitialized ArrayList in Java is empty but not null.
Java’s ArrayList automatically handles capacity, but you can set an initial capacity.
The subList method in Java is similar to slice operations in Go.
Java doesn’t have a built-in slices package, but ArrayList provides similar functionality.
Multi-dimensional data structures can be created using nested ArrayLists.

When you run this program, you’ll see output similar to the Go example, demonstrating the various operations on ArrayLists.

Note that while Java’s ArrayList is similar to Go’s slices in many ways, there are some differences in behavior and performance characteristics. Java developers typically use ArrayList when they need a dynamic array-like structure.

Arrays in Miranda

Maps in Miranda

Learn X By Example

Title here

Slices in Miranda