单项选择题

能打印出一个双引号的语句是______。

A．System. out. println"");
B．System. out. println"*";
C．System. Out. println"/";
D．System. out. println"\"");

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单项选择题

使下列程序正常运行并且输出“Hello!”，横线处应填写的内容是______。 class Test______ public static void main(string[]args) Test t=new Test(); t. start(); Public void run() System. out. println( Hello! );

A．extends Thread
B．extends Float
C．extends Iostream
D．extends Stdio

填空题

本题中，窗口的背景色为系统桌面的颜色，在窗口中分别画空心和实心的黑色矩形、深灰色圆角矩形和浅灰色椭圆形，并且画白色粗体的“欢迎学习Java!”字符串。 import java. awt. * ; import javax. swing. * ; public class java2 public static void main(String[] args) FillFrame frame=new FillFrame(); frame. setDefaultCloseOperation (JFrame. EXIT_ON_CLOSE); frame. show(); class FillFrame extends JFrame public FillFrame() setTitle( java2 ); setSize(WIDTH, HEIGHT); FillPanel panel=new FillPanel(); panel, sctBackground(SystemColor, desktop); Container contentPane=getContentPane(); contentPane, add(panel); public static final int WIDTH=400; public static final int HEIGHT=250; class FiI1Panel extends JPanel public void paintComponent(Graphics g) ______; g. setColor(new Color(10,10,10)); g. drawRect(10,10,100,30); g. setColor(new Color(100,100,100)); g. drawRoundRect(150,10,100,30,15,15); g. setColor(new Color(150,150,150)); g. drawOval(280,10,80,30); g. setColor(new Color(10,10,10)); g. fillRect(10,110,100,30); g. setColor(new Color(100,100,100)); g. fillRoundRect(150,110,100,30,15,15); g. setColor(new Color(150,150,150)); g. fillOval(280,110,80,30); g. setColor(Color, white); Font f=new Font( 宋体 ,______, 20); g. setFont(f); g. drawString( 欢迎学习 Java! , 150,200);

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