已知:要想打印出in.txt的全部内容,需要在横线处填写()
A、read()
B、next()
C、readLine()
D、nextLine()
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在JPanel中绘图应覆盖哪个方法()
A、paint(Graphicsg)
B、paintComponent(Graphicsg)
C、print(Graphicsg)
D、repaint(Rectangler)
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Given a class Repetition: 1.package utils; 2. 3.public class Repetition{ 4.public static String twice(Strings){returns+s;} 5.} and given another class Demo: 1.//insert code here2. 3.public class Demo{ 4.public static void main(String[]args){ 5.System.out.println(twice("pizza")); 6.} 7.} Which code should be inserted at line 1 of Demo.java to compile and run Demo to print“pizzapizza”?()
A、import utils.*;
B、static import utils.*;
C、importutils.Repetition.*;
D、static importutils.Repetition.*;
E、import utils.Repetition.twice();
F、import static utils.Repetition.twice;
G、static import utils.Repetition.twice;
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1. class HorseRadish { 2. // insert code here 3. protected HorseRadish(int x) { 4. System.out.println("bok choy"); 5. } 6. } 7. class Wasabi extends HorseRadish { 8. public static void main(String [] args) { 9. Wasabi w = new Wasabi(); 10. } 11. } 分别插入到第 2 行,哪两项允许代码编译并产生"bok choy" 输出结果?()
A// just a comment
Bprotected HorseRadish() { }
Cprotected HorseRadish() { this(42);}
Dprotected HorseRadish() { new HorseRadish (42);}
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已知:那么,在哪种情况下可以访问x()
A、任意类
B、只有类C
C、只有类C的子类
D、包p中的类
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两个字符串连接程序