Float Wrapper Class

• Float class is presented in java.lang package
• java.lang.Float class is used to represent primitive float value to Float object.

Float Class Definition

1. public final class Float
2. extends Number
3. implements Comparable<Float>

Float Class Constructors

1.public Float(double value)

1. package com.instanceofjavatutorial;
2.  
3. public class FloatDemo {
4.  
5. public static void main(String[] args) {
6.  
7. 
   
8.  Float f = new Float(22.56d);
9.   System.out.println(f);
10.  
11.  
12. }
13. }

Output:

1. 22.56

2.public Float(float value)

1. package com.instanceofjavatutorial;
2.  
3. public class FloatDemo {
4.  
5. public static void main(String[] args) {
6.  
7. 
   
8.  Float f = new Float(22.56f);
9.   System.out.println(f);
10.  
11.  
12. }
13. }

Output:

1. 22.56

3.public Float(String s) throws NumberFormatException

1. package com.instanceofjavatutorial;
2.  
3. public class FloatDemo {
4.  
5. public static void main(String[] args) {
6.  
7. 
   
8.  Float f = new Float("22.56f");
9.   System.out.println(f);
10.  
11.  
12. }
13. }

Output:

1. 22.56

Float Class Methods:

1.public static Float valueOf(String s) throws NumberFormatException 

• This method used to convert string value to float value. If the string contains non parsable value then it throws NumberFormatException 

1. package com.instanceofjavatutorial;
2.  
3. public class FloatValueOfDemo {
4.  
5. public static void main(String[] args) {
6.  
7.  String str="56.32";
8. 
   
9.  Float f = Float.valueOf(str);
10.   System.out.println(f);
11.  
12.  
13. }
14. }

Output:

1. 56.32

2.public String toString()

• This method returns String value from Float Object.

1. package com.instanceofjavatutorial;
2.  
3. public class FloatValueOfDemo {
4.  
5. public static void main(String[] args) {
6.   
7.  Float f = new Float("12.3")
8.  String str=f.toString();
9. 
   
10.   System.out.println(str);
11.  
12.  
13. }
14. }

Output:

1. 12.3

3.public static float parseFloat(String s) throws NumberFormatException

• This method returns float value from string object. If string doesnt contains parsable float value then throws NumberFormatException 

1. package com.instanceofjavatutorial;
2.  
3. public class FloatDemo {
4.  
5. public static void main(String[] args) {
6.  
7.  String str="20";
8. 
   
9.  Float f = Float.parseFloat(str);
10.   System.out.println(f);
11.  
12.  
13. }
14. }

Output:

1. 20.0