Example of wrapper class
class WraperDemo { public static void main(String[] args) { String s[] = {"10", "20"}; System.out.println("Sum before:"+ s[0] + s[1]); // 1020 int x=Integer.parseInt(s[0]); // convert String to Integer int y=Integer.parseInt(s[1]); // convert String to Integer int z=x+y; System.out.println("sum after: "+z); // 30 } }
Output
Sum before: 1020 Sum after: 30
Convert Java String to Integer object Example
- /*
- Convert String to Integer example
- This example shows how we can convert String object to Integer object.
- */
- public class StringToIntegerExample {
- public static void main(String[] args) {
- //We can convert String to Integer using following ways.
- //1. Construct Integer using constructor.
- Integer intObj1 = new Integer("100");
- System.out.println(intObj1);
- //2. Use valueOf method of Integer class. This method is static.
- String str = "100";
- Integer intObj2 = Integer.valueOf(str);
- System.out.println(intObj2);
- //Please note that both method can throw a NumberFormatException if
- //string can not be parsed.
- }
- }
- /*
- Output of the program would be :
- 100
- 100
- */
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