Java

Java is a high-level, general-purpose, memory-safe, object-oriented programming language.

In LiveCodes, Java runs in the browser using DoppioJVM.

Usage

Demo:

import LiveCodes from '../../src/components/LiveCodes.tsx';

export const javaConfig = { activeEditor: 'script', script: { language: 'java', content: `public class BinarySearchSnippet { /**

Search an item with binarySearch algorithm.
@param arr sorted array to search
@param item an item to search
@return if item is found, return the index position of the array item otherwise return -1 */

public static int binarySearch(int[] arr, int left, int right, int item) { if (right >= left) { int mid = left + (right - left) / 2; if (arr[mid] == item) { return mid; }

  if (arr[mid] > item) {
    return binarySearch(arr, left, mid - 1, item);
  }

  return binarySearch(arr, mid + 1, right, item);
}
return -1;

}

public static void main(String[] args) { int[] sortedArray = {1, 3, 5, 7, 9, 11, 13, 15}; int itemToSearch = 7;

int result = binarySearch(sortedArray, 0, sortedArray.length - 1, itemToSearch);

if (result == -1) {
  System.out.println("Result: Item not found in the array.");
} else {
  System.out.println("Result: Item found at index -> " + result);
}

} } `, }, mode: 'simple', editor: 'auto', tools: { status: 'full', }, };

Communication with JavaScript

The Java code runs in the context of the result page. A few helper properties and methods are available in the browser global livecodes.java object:

livecodes.java.input: the initial standard input that is passed to the Java code.
livecodes.java.loaded: A promise that resolves when the Java environment is loaded. Any other helpers should be used after this promise resolves.
livecodes.java.output: the standard output.
livecodes.java.error: the standard error.
livecodes.java.exitCode: the exit code.
livecodes.java.run: a function that runs the Java code with new input. This function takes a string as input and returns a promise that resolves when the Java code is done running. The promise resolves with an object containing the input, output, error, and exitCode properties.

Example:

Language Info

Name

java

Extension

.java

Editor

script

Compiler

DoppioJVM

Version

DoppioJVM: v0.5.0, which runs Java 8 JDK.

Code Formatting

Using Prettier with the Prettier Java plugin.

Live Reload

By default, new code changes are sent to the result page for re-evaluation without a full page reload, to avoid the need to reload the Java environment.

This behavior can be disabled by adding the code comment // __livecodes_reload__ to the code, which will force a full page reload. This comment can be added in the hiddenContent property of the editor#markup) for embedded playgrounds.

Starter Template

https://livecodes.io/?template=java

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