![]() ![]() May use System.currentTimeMillis() and the return is immutable and thread-safe. Using the best available system clock, this method returns the current instant, then converting it to date and time with the default time zone. It obtains the current instant and converts it to a time or date with time zone use. To get the time zone currently used never returns null. This method of clock class overrides the Object.equals method. Returns true if the clocks are equal, else false. equalsĬompares if the clock is equal to any other clock. Simply return the current instant of the clock and not null. The following are the methods with respective descriptions. Just like any other class in Java Programming Language, Clock comes with various methods for respective usages. Now that we have understood the definition and syntax for Clock class let us learn its methods. Proper implementation of the above declaration will result in the expected output for the Clock class. This is a simple standard syntax for the Clock class, which, as we can see, extends Object. Syntax: public abstract class Clock extends Object So, now that we have understood the Clock class in java let us now understand the syntax and its usage. Not to overlook that the use of the clock is optional. The best Practice for better implementation of the Clock class is to pass it into a method where the current instant is required. Use the default text position of CENTER, TRAILING (RIGHT).ī1.setToolTipText("Click this button to disable "ī2.setToolTipText("This middle button does nothing "ī3.FixedClock, OffsetClock, SystemClock, and TickClock are the four implementations of Java Clock these are static methods and part of the Java class. ImageIcon rightButtonIcon = createImageIcon("images/left.gif") ī1 = new JButton("Disable middle button", leftButtonIcon ) ī1.setVerticalTextPosition(AbstractButton.CENTER) ī1.setHorizontalTextPosition(AbstractButton.LEADING) //aka LEFT, for left-to-right localesī1.setMnemonic(KeyEvent.VK_D) b1.setActionCommand("disable") b2 = new JButton("Middle button", middleButtonIcon ) ī2.setVerticalTextPosition(AbstractButton.BOTTOM) ī2.setHorizontalTextPosition(AbstractButton.CENTER) ī2.setMnemonic(KeyEvent.VK_M) b3 = new JButton("Enable middle button", rightButtonIcon ) ImageIcon middleButtonIcon = createImageIcon("images/middle.gif") ImageIcon leftButtonIcon = createImageIcon("images/right.gif") The bold code is the code that would remain if the buttons had no images. Item listener, which is notified when the check box is selected or deselected.īuttonDemo.java that creates the buttons in the previous example and reacts to button clicks. Generally, you implement anĪction listener, which is notified every time the user clicks the button. How you implement event handling depends on the type of button you use and how you use it. For example, you could provide gray versions of the images used in the left and right buttons. However, you could provide an image to be substituted for the normal image. When a button is disabled, the look and feel automatically generates the button's disabled appearance. For example, Alt-M would click the Middle button in ButtonDemo. In most look and feels, the user can click a button by pressing the Alt key and the mnemonic. The underlined letter in each button's text shows the mnemonic the keyboard alternative for each button. In ButtonDemo, each button has its text in a different place, relative to its image. It enables the middle button and the left button, and disables itself.Īs the ButtonDemo example shows, a Swing button can display both text and an image. It disables the middle button (and itself, since it is no longer useful) and enables the right button. Alternatively, to compile and run the example yourself, consult the example index. Java™ Web Start ( download JDK 7 or later). Click the Launch button to run the Button Demo using.
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