float x=(float )(Math.random())*100;float
y=(float )(Math.random())*100; MyExam6
MyExam6(2,3);System.out.println(\
System.out.println(\obj.min());}}
6. 对于一个二维整型数组，计算各行元素之和并查找其值最大的那个行。
public class MyExam7 {public static void main(String[] args) {int
s
[][]={{21,24,25,26,38,},{25,28,24,69,66}
};int
obj=new
sum[]=new int[2];int so[]=new int[5]; int i;int j;int min=0;for(j=0;j<2;j++){for(i=0;i<5;i++){so[i]=so[i]+s[j][i];sum[j]=sum[j]+so[i];min=sum[0];if(sum[j] 7. 现有接口定义如下interface shape2D {double pi=3.14;double area( ); } 请编写类Circle，实现上述接口，用于计算圆与矩形的面积。 29 public interface shape2D { double pi=3.14; double area();}public class Circle implements shape2D{public double area() { double r = 5;double area = pi*r*r;return area; }}public class Rectangle implements shape2D{public double area() { double w = 4; double h = 6; double area = w*h; return area; }}public class Test { public static void main(String[] args) { Circle circle = new Circle(); Rectangle rectangle = new Rectangle(); System.out.println(circle.area()); System.out.println(rectangle.area()); }} 8. 创建一个黄色（Color.yellow）面板，通过add（）方法在该面板中添加一个按钮，然后将该面板添加到一个JFrame实例的靠南位置，JFrame实例的背景为蓝绿色（Color.CYAN）。 import java.awt.BorderLayout;import java.awt.Color;import java.awt.Dimension;import javax.swing.JFrame;import java.awt.EventQueue;import javax.swing.JPanel;public class Main{public static void main(String[] args) { final JFrame frame = new JFrame();frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);frame.setLayout(new BorderLayout());frame.getContentPane().setBackground(Color. 30 CYAN);JPanel panel = new JPanel();panel.setBackground(Color.YELLOW); panel.setPreferredSize(new Dimension(20,20)); frame.getContentPane().add(panel, BorderLayout.SOUTH);frame.setSize(200, 200); EventQueue.invokeLater(new Runnable() { public void run() {frame.setVisible(true); } }); }} import java.awt.*;import javax.swing.*;public class FrameWithPanel {public static void main(String s[]) {JFrame frame=new JFrame(\ contentPane=frame.getContentPane();contentPane.setBackground(Color.CYAN); JPanel contentPane=new JPanel(); panel.setBackground(Color.yellow);JButton button=new JButton(\orderLayout.SOUTH);frame.setSize(300,200);frame.setVisible(true); }} *9. 创建一个包含一个按钮的窗体，当用户按下该按钮时，显示一个对话框。 import java.awt.BorderLayout;import java.awt.Button;import 31 java.awt.Container;import java.awt.Dialog;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import javax.swing.JButton;import javax.swing.JDialog;import javax.swing.JFrame;import javax.swing.JLabel;public class java.awt.Frame;import MyExam14 implements ActionListener { JFrame frame; JDialog dialog; JButton button; public static void main(String arg[]) {MyExam14 jd = new MyExam14(); jd.go(); } public void go() { dialog = new frame = new JFrame(\ JDialog(frame, \ dialog.getContentPane().add(new JLabel(\ dialog.setSize (60, 40); button = new JButton(\ button.addActionListener(this);Container cp = frame.getContentPane();cp.add(button, BorderLayout.SOUTH); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setSize(200, 150); void dialog.setVisible(true); 32 frame.setVisible(true); } public actionPerformed(ActionEvent e) {