Contents

  1. ./First.java
  2. ./Float.java
  3. ./Conversion.java

./First.java 1/3

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/**
 * This class demonstrates some basic Java syntax
 *
 * @author Sara Sprenkle
 *
 * All code in a Java program must belong to a class.
 * There is typically one class per file, and the file name is ClassName.java
 * Compile this code using
 *     javac First.java
 * Run the compiled bytecode First.class using
 *     java First
 */
public class First {  //File must be saved as First.java
  
   /**
    * Called when user runs 
    *  java First
    */
   public static void main(String[] args) { //Blocks start/end with {}
       System.out.println("This is my first Java program!"); //Lines end with ;
       System.out.println("To print a \\, you must use \"\\\\\"");
   }
}

./Float.java 2/3

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/**
 * This class demonstrates how to specify floats vs doubles in Java.
 *
 * @author Sara Sprenkle
 */
public class Float { 
  
   /**
    * Called when user runs 
    *  java Float
    */
   public static void main(String[] args) {
       float f = 3.14f;
   }
}

./Conversion.java 3/3

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/**
 * This class converts from inches to centimeters.
 * 
 * This class demonstrates variable declarations and class constants.
 *
 * @author Sara Sprenkle
 *
 */
public class Conversion {  
    
    static final double CM_PER_INCH = 2.540;
  
   /**
    * Called when user runs 
    *  java Conversion
    */
    public static void main(String[] args) {
        int numInches = 1;
        
        double numCM = numInches*CM_PER_INCH;
        
        // need to put + in between string literals and variables
        // need to put explicit spaces into string literals
	// Note that Java will automatically convert the ints and doubles
	// to strings
        System.out.println("There are " + numCM + " cm in " + numInches + " inches.");       
        
    }
}

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