Selection

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Selection1.java

public class Selection1 {

	public static void main(String[] args) {
		System.out.println("Start...");
		if (args.length != 2) {
			System.out.println("You need at least two command line arguments!");
		}
		System.out.println("Finish...");
	}
}

Selection2.java

import org.pureprogrammer.Utils;

public class Selection2 {

	public static void main(String[] args) {
		final int x = Utils.stoiWithDefault(args[0], 0);
		System.out.println("Start...");
		if (x > 10) {
			System.out.println("Greater than 10");
		} else {
			System.out.println("Less than or equal to 10");
		}
		System.out.println("Finish...");
	}
}

Selection3.java

import org.pureprogrammer.Utils;

public class Selection3 {

	public static void main(String[] args) {
		final int x = Utils.stoiWithDefault(args[0], 0);
		System.out.println("Start...");
		if (x > 1000) {
			System.out.println("Greater than 1000");
		} else if (x > 100) {
			System.out.println("Greater than 100 but less than or equal to 1000");
		} else {
			System.out.println("Less than or equal to 100");
		}
		System.out.println("Finish...");
	}
}

Selection4.java

import org.pureprogrammer.Utils;

public class Selection4 {

	public static void main(String[] args) {
		final int x = Utils.stoiWithDefault(args[0], 0);
		switch (x) {
			case 1:
				System.out.println("One");
				break;
			case 2:
				System.out.println("Two");
				break;
			case 3:
			case 4:
				System.out.println("Three or Four");
				break;
			default:
				System.out.println("Just don't know!");
				break;
		}
	}
}

Selection5.java

import org.pureprogrammer.Utils;

public class Selection5 {

	public static void main(String[] args) {
		String x = Utils.uniAt(args[0], 0);
		x = x.toLowerCase();
		switch (x) {
			case "a":
			case "e":
			case "i":
			case "o":
			case "u":
				System.out.println(Utils.format("{0:c} is a vowel", x.codePointAt(0)));
				break;
			case "y":
				System.out.println("y is sometimes a vowel");
				break;
			default:
				System.out.println(Utils.format("{0:c} is a consonant", x.codePointAt(0)));
				break;
		}
	}
}

Questions

• {{Who's on first?}}
• {{Who's on second?}}
• {{Who's on third?}}

Projects

More ★'s indicate higher difficulty level.

• FICA Taxes (Revisited)
• FICA Taxes (Empoyee and Employer)
• Football Passer Rating (NFL and NCAA)
• Income Tax (Single Taxpayer)
• Income Tax
• Pythagorean Theorem
• Retirement Calculator

References

• [[Java Language Specification]], Java SE 21 Edition, Gosling, et. al., 2023.
• [[Java Tutorials]]
• [[Java at TutorialsPoint]]
• Download Java at [[Amazon Corretto]], [[Azul Zulu]], [[Eclipse Temurin]] or [[Oracle JDK]]