ResourceBundle getString(String) in Java

getString(String): This method is available in java.util.ResourceBundle class of Java.

Syntax:

String java.util.ResourceBundle.getString(String key)

This method takes one argument. This method gets a string for the given key from this resource bundle or one of its parents.

Parameters: One parameter is required for this method.

key: the key for the desired string.

Returns: the string for the given key.

Throws:

1. NullPointerException - if key is null.

2. MissingResourceException - if no object for the given key can be found.

3. ClassCastException - if the object found for the given key is not a string

Approach 1: When no exception

Java

import java.util.Locale;
import java.util.ResourceBundle;

public class ResourceBundlegetString {
    public static void main(String[] args) {

        ResourceBundle bundle = 
         ResourceBundle.getBundle("Hello", Locale.US);

        String key = "Hello";

        System.out.println(bundle.getString(key));
    }
}

Output:

Hello Java Program

Approach 2: NullPointerException

Java

import java.util.Locale;
import java.util.ResourceBundle;

public class ResourceBundlegetString {
    public static void main(String[] args) {

        ResourceBundle bundle = 
        ResourceBundle.getBundle("Hello", Locale.US);

        String key = null;

        System.out.println(bundle.getString(key));
    }
}

Output:

Exception in thread "main" java.lang.NullPointerException
	at java.base/java.util.PropertyResourceBundle.handleGetObject(PropertyResourceBundle.java:207)
	at java.base/java.util.ResourceBundle.getObject(ResourceBundle.java:555)
	at java.base/java.util.ResourceBundle.getString(ResourceBundle.java:521)
	

Approach 3: MissingResourceException 

Java

import java.util.Locale;
import java.util.ResourceBundle;

public class ResourceBundlegetString {
    public static void main(String[] args) {

        ResourceBundle bundle = 
        ResourceBundle.getBundle("Hello", Locale.US);

        String key = "hello";

        System.out.println(bundle.getString(key));
    }
}

Output:

Exception in thread "main" java.util.MissingResourceException: Can't find resource for bundle java.util.PropertyResourceBundle, key hello
	at java.base/java.util.ResourceBundle.getObject(ResourceBundle.java:564)
	at java.base/java.util.ResourceBundle.getString(ResourceBundle.java:521)