Web Reference: Jul 11, 2025 · In Java, the isEmpty () method of ArrayList is used to check if an ArrayList is empty. Example 1: Here, we use the isEmpty () method to check whether an ArrayList of integers is empty. Return Type: It returns a boolean value, true if the list is empty, otherwise false. Definition and Usage The isEmpty() method returns true if a list has no items and false otherwise. How can I check if a list is empty? If so, the system has to give a message saying List is empty. If not, the system has to give a message saying List is not empty. Users can enter numbers, -1 to stop the program. This is the code I now have, but this doesn't work, it always says 'List isn't empty'. import javax.swing.JOptionPane;
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