普通按钮 JButton 构造显示文本为“ Sample”的按钮 JButton b= new JButton(“ Sample”) 构造显示文本为“ Sample”、带有钻石形 状小图标的按 ◆ Sample JButton b= new JButton("Sample", new ImageIcon("icon. gif))普通按钮JButton § 构造显示文本为“Sample”的按钮 § 构造显示文本为“Sample” 、带有钻石形 状小图标的按钮 JButton b = new JButton(“Sample” )； JButton b = new JButton("Sample" ,new ImageIcon("icon.gif"));