Java基礎 awt Button 點擊按鈕后在控制台輸出文字

•     JDK ：OpenJDK-11
•      OS ：CentOS 7.6.1810
•      IDE ：Eclipse 2019‑03
• typesetting ：Markdown

 

code

package per.jizuiku.gui;

import java.awt.Button;
import java.awt.FlowLayout;
import java.awt.Frame;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

/**
 * @author 給最苦
 * @date 2019/06/30
 * @blog www.cnblogs.com/jizuiku
 */
public class Demo {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Frame f = new Frame();

        // 設置窗體大小
        int width = 300;
        int height = 400;
        f.setSize(width, height);

        // 創建按鈕對象,在按鈕上添加文字
        Button b = new Button("I am a button.");
        b.setSize(10, 30);

        // 點擊按鈕后
        b.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent e) {
                // TODO Auto-generated method stub
                System.out.println("點擊按鈕");
            }
        });

        // 采用了流式布局
        f.setLayout(new FlowLayout());

        // 把按鈕添加到窗體上
        f.add(b);

        // 設置窗體可見
        f.setVisible(true);
    }

}

 

result

點擊按鈕
點擊按鈕
點擊按鈕

 

sourceCode

    /**
     * Adds the specified action listener to receive action events from
     * this button. Action events occur when a user presses or releases
     * the mouse over this button.
     * If l is null, no exception is thrown and no action is performed.
     * <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
     * >AWT Threading Issues</a> for details on AWT's threading model.
     *
     * @param         l the action listener
     * @see           #removeActionListener
     * @see           #getActionListeners
     * @see           java.awt.event.ActionListener
     * @since         1.1
     */
    public synchronized void addActionListener(ActionListener l) {
        if (l == null) {
            return;
        }
        actionListener = AWTEventMulticaster.add(actionListener, l);
        newEventsOnly = true;
    }

 

resource

• [ JDK ] openjdk.java.net
• [ doc - 參考 ] docs.oracle.com/en/java/javase/11
• [ 規范 - 推薦 ] yq.aliyun.com/articles/69327
• [ 規范 - 推薦 ] google.github.io/styleguide
• [ 源碼 ] hg.openjdk.java.net
• [ OS ] www.centos.org
• [ IDE ] www.eclipse.org/downloads/packages
• [ 平台 ] www.cnblogs.com

 

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感謝幫助過 給最苦 的人們。
Java、Groovy和Scala等基於JVM的語言，優秀，值得學習。
規范的命名和代碼格式等，有助於溝通和理解。
JVM的配置、監控與優化，比較實用，值得學習。