How do I turn on the Caps Lock button?

By I Wayan Saryada in AWT, Core API 0 Comment

The code below show you how to activate the Caps Lock button programmatically. Setting the locking state to Boolean.TRUE will turn the Caps Lock on.

package org.kodejava.awt;

import java.awt.Toolkit;
import java.awt.event.KeyEvent;

public class TurnCapsLockOn {
    public static void main(String[] args) throws Exception {
        // Gets the default toolkit.
        Toolkit toolkit = Toolkit.getDefaultToolkit();

        // Update the locking state for caps lock button to true 
        // will turn the caps lock on.
        toolkit.setLockingKeyState(KeyEvent.VK_CAPS_LOCK, Boolean.TRUE);
    }
}

How do I read the status of Scroll Lock key?

By I Wayan Saryada in AWT, Core API 0 Comment

This example show you how to detect if the Scroll Lock key is in active mode. If you run the program you will get an output telling you that the Scroll Lock button is active or not active.

package org.kodejava.awt;

import java.awt.Toolkit;
import java.awt.event.KeyEvent;

public class ScrollLockState {
    public static void main(String[] args) {
        Toolkit toolkit = Toolkit.getDefaultToolkit();

        // Get the locking state of the Scroll Lock button. This method 
        // return boolean true value if it is "on".
        boolean isOn = toolkit.getLockingKeyState(KeyEvent.VK_SCROLL_LOCK);

        System.out.println("ScrollLock button is " + (isOn ? "on" : "off"));
    }
}

How do I read the status of Num Lock key?

By I Wayan Saryada in AWT, Core API 2 Comments

This example show you how to detect if the Num Lock key is in active mode. If you run the program you will get an output telling you that the Num Lock button is active or not active.

package org.kodejava.awt;

import java.awt.Toolkit;
import java.awt.event.KeyEvent;

public class NumLockState {
    public static void main(String[] args) {
        Toolkit toolkit = Toolkit.getDefaultToolkit();

        // Get the locking state of the Num Lock button. This method
        // return boolean true value if it is "on".
        boolean isOn = toolkit.getLockingKeyState(KeyEvent.VK_NUM_LOCK);

        System.out.println("NumLock button is " + (isOn ? "on" : "off"));
    }
}

How do I read the status of Caps Lock key?

By I Wayan Saryada in AWT, Core API 0 Comment

This example show you how to detect if the Caps Lock key is in active mode.

package org.kodejava.awt;

import java.awt.Toolkit;
import java.awt.event.KeyEvent;

public class CapsLockState {
    public static void main(String[] args) {
        // Get the locking state of the Caps Lock button. This method
        // return boolean true value if it is "on".
        boolean isOn = Toolkit.getDefaultToolkit().getLockingKeyState(
                KeyEvent.VK_CAPS_LOCK);

        System.out.println("CapsLock button is " + (isOn ? "on" : "off"));
    }
}

How do I read a file into byte array?

By I Wayan Saryada in Core API, IO 0 Comment 
package org.kodejava.io;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;

public class ReadFileIntoByteArray {
    public static void main(String[] args) throws IOException {
        File file = new File("README.md");
        try (InputStream is = new FileInputStream(file)) {
            if (file.length() > Integer.MAX_VALUE) {
                throw new IOException("File is too large.");
            }

            int offset = 0;
            int bytesRead;
            byte[] bytes = new byte[(int) file.length()];
            while (offset < bytes.length
                    && (bytesRead = is.read(bytes, offset, bytes.length - offset)) >= 0) {
                offset += bytesRead;
            }
        }
    }
}