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java cheat sheet

Lorenzo Satta Chiris answered on January 4, 2021 Popularity 10/10 Helpfulness 5/10

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java cheat sheet

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Best Java Cheat Sheet:
https://introcs.cs.princeton.edu/java/11cheatsheet/

Popularity 10/10 Helpfulness 5/10 Language java

Source: introcs.cs.princeton.edu

Tags: java

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Contributed on Jan 04 2021

Lorenzo Satta Chiris

0 Answers Avg Quality 2/10

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// JAVA PROGRAMMING CHEATSHEET

// COMMENTS
// Single-line comment

/*
   Multi-line
   comment
*/

// DATA TYPES
// Primitive data types
byte    // 1 byte   (range: -128 to 127)
short   // 2 bytes  (range: -32,768 to 32,767)
int     // 4 bytes  (range: -2^31 to 2^31-1)
long    // 8 bytes  (range: -2^63 to 2^63-1)
float   // 4 bytes  (decimal precision: 7 digits)
double  // 8 bytes  (decimal precision: 15-16 digits)
char    // 2 bytes  (single character)
boolean // 1 bit    (true or false)

// VARIABLES
dataType variableName = value; // Variable declaration and initialization

// CONSTANTS
final dataType CONSTANT_NAME = value; // Declare a constant

// CONDITIONAL STATEMENTS
if (condition) {
    // Code to execute if the condition is true
} else if (anotherCondition) {
    // Code to execute if the first condition is false and this one is true
} else {
    // Code to execute if all conditions are false
}

// SWITCH STATEMENT
switch (variable) {
    case value1:
        // Code to execute if variable is equal to value1
        break;
    case value2:
        // Code to execute if variable is equal to value2
        break;
    default:
        // Code to execute if variable does not match any case
        break;
}

// LOOPS
// For loop
for (int i = 0; i < limit; i++) {
    // Code to repeat
}

// While loop
while (condition) {
    // Code to repeat as long as the condition is true
}

// Do-While loop
do {
    // Code to repeat at least once before checking the condition
} while (condition);

// ARRAYS
dataType[] arrayName = new dataType[size]; // Declaration and initialization of an array

// METHODS (FUNCTIONS)
dataType methodName(parameter1Type parameter1, parameter2Type parameter2) {
    // Method code
    return result; // Optional return statement
}

// OBJECTS AND CLASSES
class ClassName {
    dataType attribute1;
    dataType attribute2;

    ClassName(dataType param1, dataType param2) {
        // Constructor code
    }

    dataType methodName(parameterType param) {
        // Method code
    }
}

// OBJECT CREATION
ClassName objectName = new ClassName(arg1, arg2);

// INHERITANCE
class Subclass extends Superclass {
    // Subclass-specific attributes and methods
}

// INTERFACE
interface InterfaceName {
    // Method signatures (methods without implementation)
}

// IMPLEMENT INTERFACE
class ClassName implements InterfaceName {
    // Implement the interface's methods
}

// EXCEPTION HANDLING
try {
    // Code that might throw an exception
} catch (ExceptionType exceptionName) {
    // Code to handle the exception
} finally {
    // Code that always executes, regardless of exception
}

// FILE I/O
import java.io.*; // Import the required package

// Read from a file
BufferedReader reader = new BufferedReader(new FileReader("filename.txt"));
String line;
while ((line = reader.readLine()) != null) {
    // Process the line
}
reader.close();

// Write to a file
BufferedWriter writer = new BufferedWriter(new FileWriter("filename.txt"));
writer.write("Hello, World!");
writer.close();

Popularity 9/10 Helpfulness 3/10 Language css

Source: chat.openai.com

Tags: css

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Contributed on Jul 27 2023

Charming Cheetah

0 Answers Avg Quality 2/10

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