java面向对象程序设计期末考试编程题！急！！！

===============================第一题==============================

import java.applet.Applet

import java.awt.Color

import java.awt.Label

public class test extends Applet {

private Label label

@Override

public void init() {

label=new Label("欢迎来到java世界！")

label.setBackground(Color.BLUE)

setBackground(Color.PINK)

add(label)

}

}

===============================第二题==============================

因为没图,所以自己设计的界面..

import java.awt.BorderLayout

import java.awt.event.ActionEvent

import java.awt.event.ActionListener

import javax.swing.JButton

import javax.swing.JFrame

import javax.swing.JLabel

import javax.swing.JPanel

import javax.swing.JScrollPane

import javax.swing.JTextArea

public class test implements ActionListener {

private JFrame frame

private JLabel label

private JTextArea jt

private JScrollPane jsp

private JButton show

public test() {

frame=new JFrame("Test")

label=new JLabel("显示内容")

jt=new JTextArea(10,20)

jsp=new JScrollPane(jt)

show = new JButton("显示给定内容")

JPanel panel=new JPanel()

panel.add(label)

panel.add(show)

frame.add(jsp,BorderLayout.NORTH)

frame.add(panel,BorderLayout.SOUTH)

show.addActionListener(this)

show()

}

public void show(){

frame.setLocation(200, 200)

frame.setSize(300, 260)

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE)

frame.setVisible(true)

}

@Override

public void actionPerformed(ActionEvent e) {

label.setText(jt.getText())

}

public static void main(String[] args) {

new test().show()

}

}

结果为：

1 2 3

2 3 4

3 4 5

4 5 6

public class c3_4 {

public static void main(String[] args) {

int a[][] = { { 1, 2, 3, 4 }, { 2, 3, 4, 5 }, { 3, 4, 5, 6 } }

int b[][] = new int[4][3]

int i, j

for (i = 0i <3i++) {

for (j = 0j <4j++) {

b[j][i] = a[i][j]

}

}

for (i = 0i <4i++) {

for (j = 0j <3j++){

System.out.print(b[i][j] + "\t")

}

System.out.println()

}

}

}

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