阅读下面代码: import java.awt.*; public class Exam11_1 { private Frame.
import java. awt. *;
import java. awt. event. *;
import javax. swing. *;
import java. applet. *;
import java. util. *;
public class Ex0509 extends Applent implements Actionlistener
JTextArea textA=new JTextArea(5, 25 ) ;
JButton button1=new JButton("求和" ) ;
JButton button2=new JButton("求平均值") ;
JLabel label=new JLabel("结果: ", JLahel. RIGHT) ;
JTextField text=new JTextField(15) ;
public void init()
{
setSize(400, 200) ;
setBackground(Color. blue) ;
JPanel panButt=new JPanel(new GridLayout(1, 2) ) ;
panButt. add(button1) ;
panButt. add(button2) ;
button1. addActionListener(this) ;
button2. addActionListener(this) ;
JPanel panResult=new JPanel(new GridLayout(1, 2) ) ;
panResult. add(label) ;
panResult. add(text) ;
add(textA. ;
add(panButt) ;
add(panResult) ;
}
public void actionPerformed (ActionEvent e)
{
//这里是你编写的代码
}
}
import j avax. swing. *;
import Java. awt. event. *;
class MiYal extends JPanel
{
JButton button[] =new JButton[3] ;
JTextField text;
MiYal()
{
for(int i=0; i<3; i++)
{
button[i] =new JButton("button0"+(i+1) ) ;
add(button[i] ) ;
}
text=new JTextField(10) ;
text. setHorizontalAlignment(JTextField. CENTER) ;
add(text) ;
}
}
public class C3801 implements ActionListener
{
JFrame. myWin:
MiYal panel;
C3801()
{
panel=new MiYal() ;
myWin=new JFrame("C3801") ;
myWin. add(panel) ;
myWin. setDefaultCloseOperation(JFrame. EXIT_ON_CLOSE. ;
for(int i=0; i<3; i++)
panel. button[i] . addActionListener(this) ;
myWin. pack() ;
myWin. setVisible(true) ;
}
public stalic void main(String[] args)
{
new C3801() ;
}
public void actionPerformed(ActionEvent e)
{
//这里是你要编写的代码
}
}
阅读如下代码:import pandas as pd
dt={'one':[9,8,7,6],'two':[3,2,1,0]}
a=p
D.DataFrame(dt)
希望获得['one','two'],使用如下哪个语句?()
A.A.row
B.A.columns
C.A.index
D.A.values
import java.io.*;
public class abc
{
public static void main(String args[ ])
{
AB s = new AB("Hello!","I love JAVA.");
System.out.println(s.toString());
}
}
class AB
{
String s1;
String s2;
AB (String str1 , String str2 )
{
s1 = str1;
s2 = str2;
}
public String toString() { return s1+s2;
}
}
A.(编译指令)指令directive
B.(操作指令)动作action
C.(Jsp代码)脚本元素sriptlet
D.Javascript代码
A.P是t分布P(t£2)的累积概率
B.P是标准正态分布P(z£2)的累积概率
C.P是正态分布P(x£2)的累积概率
D.P是均匀分布P(x£2)的累积概率
A.package testpackage;
public class Test{ }
B. import java.io.*;
package testpackage;
public class Test{ }
C. import java.io.*;
class Person{ }
D. import java.io.*;
import java.awt.*;
public class Test{ }