Java Integer getInteger() method

The getInteger() method of Integer class determines the integer value of the system property with the given name.

Syntax`

public static Integer getInteger(String nm)

Parameters

The parameter ‘nm’ represents the property name.

Throws

The getInteger () method throws:

SecurityException- for the same reasons as System.getProperty

Return Value

This method returns the integer value of the property.

Example 1

public class JavaIntegerGetIntegerExample1 {
    public static void main(String[] args) {
        // it will give you an exception unless and until you have set the system property
        String str="123";
        int val=Integer.getInteger(str);
        System.out.println(val);
    }
}

Output

Exception in thread "main" java.lang.NullPointerException
            at com.TutorialAndExample.JavaIntegerGetIntegerExample1.main(JavaIntegerGetInteger
Example1.java:6)

Example 2

public class JavaIntegerGetIntegerExample2 {
    public static void main(String[] args) {
        // determines the integer value of the system property with the given name
        String str=" ";
        System.setProperty(str,"123");
        int val=Integer.getInteger(str);
        System.out.println(val);
    }
}

Output

123

Example 3

public class JavaIntegerGetIntegerExample3 {
    public static void main(String[] args) {
        // it gives an exception if value other than an integer is entered
        String str="123 ";
       System.setProperty(str,"reema@panda");
        int val=Integer.getInteger(str);
        System.out.println(val);
    }
}

Output

Exception in thread "main" java.lang.NullPointerException
            at com.TutorialAndExample.JavaIntegerGetIntegerExample3.main(JavaIntegerGetInteger
Example3.java:8)