The functionality of java.lang.Integer is that to wrap the primitive type value int in an object, this class hire the methods from java.lang.Object class, following is the declaration of this class. [java] public final class Integer extends Number implements Comparable<Integer> [/java] The functionality of java.lang.Character is that to wrap the primitive type value char in an object, this class hire the methods from java.lang.Object class, following is the declaration of this class. [java] public final class Character extends Object implements Serializable, Comparable<Character>[/java]

Following are the common using methods of java.lang.Integer class.

Following are the common using constructors of java.lang.Integer class.

Following is an example by using java.lang.Integer.toHexString() method. DemoInteger.java [java] package com.SPlessons; import java.lang.*; public class DemoInteger { public static void main(String[] args) { int i = 200; System.out.println("The Number = " + i); System.out.println("Value of Hex = " + Integer.toHexString(i)); } } [/java] To return the string representation of the unsigned integer value represented by the argument in hexadecimal (base 16), where the given value is 200. Output: The result will be as follows. [java] The Number = 200 Value of Hex = c8 [/java] Following is the syntax declaration. [java]public static Integer decode(String nm) throws NumberFormatException[/java] DemoInteger.java [java] package com.SPlessons; import java.lang.*; public class DemoInteger { public static void main(String[] args) { Integer i = new Integer(10); String str = "500"; System.out.println("The Number = " + i.decode(str)); } } [/java] The decode(str) method is used to return an Integer object holding the int value represented by string str. Output: The result will be as follows. [java]The Number = 500[/java]

Following are the common using methods of java.lang.character class.

Following are the common using fields of java.lang.character class.

Following is an example by using java.lang.Character.charValue() method. DemoCharacter.java [java] package com.SPlessons; public class DemoCharacter { public static void main(String[] args) { // create a Character object c Character c; // assign value to c c = new Character('V'); // create a char primitive ch char ch; // assign primitive value of c to ch ch = c.charValue(); String str = "The primitive char value is " + ch; // print ch value System.out.println( str ); } } [/java] To return the value of character charValue() will be used. Where the developer assigned the character that is V. Output: The result is as follows. [java] The primitive char value is V [/java] Already discussed the functionality of this method in above table, following is the syntax declaration of this method. [java] public static int getNumericValue(char ch) [/java] DemoCharacter.java [java]package com.SPlessons; public class DemoCharacter { public static void main(String[] args) { // create 2 character primitives ch1, ch2 char ch1, ch2; // assign values to ch1, ch2 ch1 = 'x'; ch2 = '8'; // create 2 int primitives i1, i2 int i1, i2; // assign numeric values of ch1, ch2 to i1, i2 i1 = Character.getNumericValue(ch1); i2 = Character.getNumericValue(ch2); String str1 = "Numeric value of " + ch1 + " is " + i1; String str2 = "Numeric value of " + ch2 + " is " + i2; // print i1, i2 values System.out.println( str1 ); System.out.println( str2 ); } } [/java] The purpose of this method is to give back the int esteem that the predetermined Unicode character represents, here the developer given the character that is x. Output: In the result the character x value will be generated. [java] Numeric value of x is 33 Numeric value of 8 is 8 [/java] DemoCharacter.java [java] package com.SPlessons; public class DemoCharacter { public static void main(String[] args) { // create 2 char primitives ch1, ch2 char ch1, ch2; // assign values to ch1, ch2 ch1 = '7'; ch2 = 'h'; // create 2 boolean primitives b1, b2 boolean b1, b2; // assign isDigit results of ch1, ch2 to b1, b2 b1 = Character.isDigit(ch1); b2 = Character.isDigit(ch2); String str1 = ch1 + " is a digit is " + b1; String str2 = ch2 + " is a digit is " + b2; // print b1, b2 values System.out.println( str1 ); System.out.println( str2 ); } } [/java] The functionality of this method is to know whether given number is a digit or not. if it is digit then it returns true otherwise, returns false. Output: The result will be as follows. where in code the developer is given number 7 so it is a digit. [java] 9 is a digit is true V is a digit is false[/java]

• The getType(char) method is used to give back a value showing a character classification.
• The static int MIN_RADIX is the field of character class.
• These both classes will hire the methods from java.lang.Object.