5 Library Classes

String, Math, Random

Section 4: Java Methods and Library Classes

Lesson 3: The String Class

Lesson 4: The Random Class

Lesson 5: The Math Class

Section 4 Quiz 2 (Lessons 3-5)

Working with the String Class

Format Strings using escape sequences including %d, %n, and %s

Working with the Random and Math Classes

Tutorials Point
1. Java Examples - String formatting
2. Java.util.Random Class
3. Math class (for absolute value, rounding, rounding down (floor), rounding up (ceiling), and more)
Udemy
1. StringBuilder and String Formatting (19:43)
Bucky's Room
1. Math Class Methods (4:50)
2. Random Number Generator (5:14)

String formatting

// %d decimal number

// %n line break

// %s a string

System.out.format("the %s jumped %n over the %s, %d times %n", "cow", "moon", 2);

Random

// create random object, only do this once

Random randomGen = new Random();

// get next int value, you can do this as many times as you want

// nextInt will return an int between 0 (inclusive) and the specified value (exclusive)

System.out.println("Next int value: " + randomGen.nextInt(10000));