String Functions in Miranda

The standard library’s String class provides many useful string-related methods. Here are some examples to give you a sense of the available functionality.

import java.util.Arrays;

public class StringFunctions {
    public static void main(String[] args) {
        // We use System.out.println directly as it's already short in Java
        
        // Here's a sample of the methods available in String class.
        // Since these are methods on the string object itself,
        // we call them directly on the string. You can find more
        // methods in the String class documentation.
        
        System.out.println("Contains:  " + "test".contains("es"));
        System.out.println("Count:     " + countOccurrences("test", 't'));
        System.out.println("HasPrefix: " + "test".startsWith("te"));
        System.out.println("HasSuffix: " + "test".endsWith("st"));
        System.out.println("Index:     " + "test".indexOf("e"));
        System.out.println("Join:      " + String.join("-", "a", "b"));
        System.out.println("Repeat:    " + "a".repeat(5));
        System.out.println("Replace:   " + "foo".replace("o", "0"));
        System.out.println("Replace:   " + "foo".replaceFirst("o", "0"));
        System.out.println("Split:     " + Arrays.toString("a-b-c-d-e".split("-")));
        System.out.println("ToLower:   " + "TEST".toLowerCase());
        System.out.println("ToUpper:   " + "test".toUpperCase());
    }

    // Java doesn't have a built-in count method, so we implement it
    private static int countOccurrences(String str, char ch) {
        return (int) str.chars().filter(c -> c == ch).count();
    }
}

When you run this program, you’ll see:

$ javac StringFunctions.java
$ java StringFunctions
Contains:  true
Count:     2
HasPrefix: true
HasSuffix: true
Index:     1
Join:      a-b
Repeat:    aaaaa
Replace:   f00
Replace:   f0o
Split:     [a, b, c, d, e]
ToLower:   test
ToUpper:   TEST

This example demonstrates various string operations in Java. Note that unlike some other languages, Java’s String methods are called directly on String objects, and some operations (like join) are static methods of the String class. For operations not directly available as methods (like count), we’ve implemented a helper method to provide similar functionality.

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