LESSON 15: 📁File Class in java🗂

🔗The File class is an abstract representation of file and directory pathname. A pathname can be either absolute or relative.

📝Once you have File object in hand, then there is a list of helper methods which can be used to manipulate the files.

Eg: public String getName()
public String getParent()
public File getParentFile()
public String getPath()
public boolean isAbsolute() ... and etc.

import java.io.*;
public class LearnTcode {
public static void main(String[] args) {

try {
File file = new File("learnTocode.txt");
if (file.createNewFile()) {
System.out.println("Join our channel");
} else {
System.out.println("File already exists.");
}
} catch (IOException e) {
e.printStackTrace();
}

}
}
//output is: Join our channel

LESSON 16: Java Operator Precedence

> Operator precedence determines the order in which the operators in an expression are evaluated.
> the operator with the highest precedence is operated first.
> the multiplication is performed before subtraction
> Example: Operator precedence

class Precedence {
public static void main(String[] args) {

int a = 10, b = 5, c = 1, result;
result = a-++c-++b;

System.out.println(result);
}
}

‼️What will be the output of the above example❓

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LESSON 17: EXCEPTION HANDLING IN JAVA

🖇 Exception handling is one of the most important feature of java programming that allows us to handle the runtime errors caused by exceptions.

✂️An Exception is an unwanted event that interrupts the normal flow of the program.

Java try and catch

The try statement allows you to define a block of code to be tested for errors while it is being executed.

The catch statement allows you to define a block of code to be executed, if an error occurs in the try block.



public class Main {
public static void main(String[ ] args) {
try {
int[] myNumbers = {1, 2, 3};
System.out.println(myNumbers[10]);//this num is not found in the array
} catch (Exception e) {
System.out.println("Something went wrong.");
}
}
}

THERE ARE 2 PRIMARY EXCEPTION TYPES:
1️⃣ Checked Exception
2️⃣ Unchecked Exception

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💻Introduction to Algorithms- MIT

GUI short notes for Java Only📝💻