Refresh Component Displays

Refresh Component Displays

When you create the visual components that make up a user interface, their size and position are usually constant. However, it’s sometimes necessary to change a component’s size or position dynamically based on some user action. For example, your application may change the text in a label that is already displayed. If the label is too small to show the entire string, you might need to refresh the display so that the label will be resized. To refresh the display of components in a container subclass such as a frame or panel, you should call the container’s invalidate() and validate() methods.

 import java.awt.*;import java.awt.event.*;public class Validation extends Frame implements ActionListener {	Button button;	public static void main(String[] args) {		Validation v = new Validation();		v.setSize(400, 300);		v.setVisible(true);	}  //  public static void main(String[] args)	public Validation() {		setLayout(new FlowLayout());		button = (Button)add(new Button("Short Label"));		button.addActionListener(this);	}  //  public Validation()	public void actionPerformed(ActionEvent event) {		button.setLabel("This is a much longer label");		invalidate();		validate();	}  //  public void actionPerformed()}  //  public class Validation extends Frame

Running this code will display a frame that contains a button, and pressing it will change the button’s label and cause it to be resized. However, if you remove the call to invalidate() and/or validate(), the button’s text will change while its size remains the same. The invalidate() method marks the container (in this case, the frame subclass) as needing to be refreshed (or “laid out”), while the validate() method actually performs the refresh operation.

Share the Post:
XDR solutions

The Benefits of Using XDR Solutions

Cybercriminals constantly adapt their strategies, developing newer, more powerful, and intelligent ways to attack your network. Since security professionals must innovate as well, more conventional endpoint detection solutions have evolved

AI is revolutionizing fraud detection

How AI is Revolutionizing Fraud Detection

Artificial intelligence – commonly known as AI – means a form of technology with multiple uses. As a result, it has become extremely valuable to a number of businesses across

AI innovation

Companies Leading AI Innovation in 2023

Artificial intelligence (AI) has been transforming industries and revolutionizing business operations. AI’s potential to enhance efficiency and productivity has become crucial to many businesses. As we move into 2023, several

data fivetran pricing

Fivetran Pricing Explained

One of the biggest trends of the 21st century is the massive surge in analytics. Analytics is the process of utilizing data to drive future decision-making. With so much of

kubernetes logging

Kubernetes Logging: What You Need to Know

Kubernetes from Google is one of the most popular open-source and free container management solutions made to make managing and deploying applications easier. It has a solid architecture that makes

ransomware cyber attack

Why Is Ransomware Such a Major Threat?

One of the most significant cyber threats faced by modern organizations is a ransomware attack. Ransomware attacks have grown in both sophistication and frequency over the past few years, forcing

data dictionary

Tools You Need to Make a Data Dictionary

Data dictionaries are crucial for organizations of all sizes that deal with large amounts of data. they are centralized repositories of all the data in organizations, including metadata such as