Strings and Output

Is a String a primitive data type or a class object?

How do we

 
1. create a String?







2. concatenate Strings?









3. add newlines, tabs, and double quotes to Strings?












4. determine the number of characters in a String?










5. convert a String to a numeric value?












6. convert a number to a String?

What methods do we use to output Strings to the monitor?

How can we format double values?

 
import java.text.*;

/**
 * Illustrate formatting output
 * @author Suzanne Balik, 5 Feb 2003
 */
public class Output {

  public static void main(String[] args) {
    
    double value = 2.0/3.0;
  
    System.out.println("value = " + value);  
  
    DecimalFormat twoDigits = new DecimalFormat("0.00");
  
    System.out.println("value = " + twoDigits.format(value));
  
    String formattedValue = twoDigits.format(value);
  
    System.out.println("value = " + formattedValue);
  }
}

/* PROGRAM OUTPUT
csc% java Output
value = 0.6666666666666666
value = 0.67
value = 0.67
*/