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Java - Integer decode() method
Description
The Java Integer decode() method decodes a String into an Integer. It accepts decimal, hexadecimal, and octal number.
Declaration
Following is the declaration for java.lang.Integer.decode() method
public static Integer decode(String nm) throws NumberFormatException
Parameters
nm − This is the String to decode.
Return Value
This method returns an Integer object holding the int value represented by nm.
Exception
NumberFormatException − if the String does not contain a parsable integer.
Example 1
The following example shows the usage of Integer decode() method to get a Integer object from a string containing decimal number. We've created a String variable and assign it a string containing decimal number. Then using decode method, we're obtaining the Integer object and printing it.
package com.tutorialspoint; public class IntegerDemo { public static void main(String[] args) { String str = "50"; /* returns an Integer object holding the int value represented by string str */ System.out.println("Number = " + Integer.decode(str)); } }
Output
Let us compile and run the above program, this will produce the following result −
Number = 50
Example 2
The following example shows the usage of Integer decode() method to get a Integer object from a string containing a negative decimal number. We've created a String variable and assign it a string containing a negative decimal number. Then using decode method, we're obtaining the Integer object and printing it.
package com.tutorialspoint; public class IntegerDemo { public static void main(String[] args) { String str = "-50"; /* returns an Integer object holding the int value represented by string str */ System.out.println("Number = " + Integer.decode(str)); } }
Output
Let us compile and run the above program, this will produce the following result −
Number = -50
Example 3
The following example shows the usage of Integer decode() method to get a Integer object from a string containing a octal number. We've created a String variable and assign it a string containing an octal number. Then using decode method, we're obtaining the Integer object and printing it.
package com.tutorialspoint; public class IntegerDemo { public static void main(String[] args) { String str = "0x3"; /* returns an Integer object holding the int value represented by string str */ System.out.println("Number = " + Integer.decode(str)); } }
Output
Let us compile and run the above program, this will produce the following result −
Number = 3
Example 4
The following example shows the usage of Integer decode() method to get a Integer object from a string containing a hexadecimal number. We've created a String variable and assign it a string containing a hexadecimal number. Then using decode method, we're obtaining the Integer object and printing it.
package com.tutorialspoint; public class IntegerDemo { public static void main(String[] args) { String str = "0xff"; /* returns an Integer object holding the int value represented by string str */ System.out.println("Number = " + Integer.decode(str)); } }
Output
Let us compile and run the above program, this will produce the following result −
Number = 255