package untitled2;
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
import com.borland.jbcl.layout.*;
public class ifexample extends Applet {
double result;
boolean isStandalone = false;
TextField paratext1 = new TextField();
TextField paratext2 = new TextField();
TextField paratext3 = new TextField();
Label label1 = new Label();
Label label2 = new Label();
Label label3 = new Label();
Button button1 = new Button();
TextField resulttext1 = new TextField();
XYLayout xYLayout1 = new XYLayout();
TextField resulttext2 = new TextField();
Label label4 = new Label();
Label label5 = new Label();
/**Get a parameter value*/
public String getParameter(String key, String def) {
return isStandalone ? System.getProperty(key, def) :
(getParameter(key) != null ? getParameter(key) : def);
}
/**Construct the applet*/
public ifexample() {
}
/**Initialize the applet*/
public void init() {
try {
jbInit();
}
catch(Exception e) {
e.printStackTrace();
}
}
/**Component initialization*/
private void jbInit() throws Exception {
paratext1.setFont(new java.awt.Font("Dialog", 0, 16));
paratext1.setText("0");
paratext2.setFont(new java.awt.Font("Dialog", 0, 16));
paratext2.setText("0");
paratext3.setFont(new java.awt.Font("Dialog", 0, 16));
paratext3.setText("0");
label1.setFont(new java.awt.Font("Dialog", 0, 16));
label1.setText("a");
label2.setFont(new java.awt.Font("Dialog", 0, 16));
label2.setText("b");
label3.setFont(new java.awt.Font("Dialog", 0, 16));
label3.setText("c");
button1.setLabel("计算");
button1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(ActionEvent e) {
button1_actionPerformed(e);
}
});
resulttext1.setEditable(false);
resulttext1.setFont(new java.awt.Font("Dialog", 0, 16));
this.setLayout(xYLayout1);
resulttext2.setEditable(false);
resulttext2.setFont(new java.awt.Font("Dialog", 0, 16));
label4.setFont(new java.awt.Font("Dialog", 0, 16));
label4.setText("x1=");
label5.setFont(new java.awt.Font("Dialog", 0, 16));
label5.setText("x2=");
this.add(paratext3, new XYConstraints(120, 100, 70, -1));
this.add(button1, new XYConstraints(120, 140, -1, -1));
this.add(paratext2, new XYConstraints(120, 70, 70, -1));
this.add(paratext1, new XYConstraints(120, 40, 70, -1));
this.add(label3, new XYConstraints(100, 100, -1, -1));
this.add(label1, new XYConstraints(100, 40, -1, -1));
this.add(label2, new XYConstraints(100, 70, -1, -1));
this.add(label4, new XYConstraints(19, 178, 46, 28));
this.add(resulttext1, new XYConstraints(69, 178, 220, -1));
this.add(resulttext2, new XYConstraints(69, 218, 220, -1));
this.add(label5, new XYConstraints(19, 218, 46, 27));
}
/**Get Applet information*/
public String getAppletInfo() {
return "Applet Information";
}
/**Get parameter info*/
public String[][] getParameterInfo() {
return null;
}
void button1_actionPerformed(ActionEvent e) {
double a1,b1,c1;
double sqrt;
double x1,x2;
resulttext1.setText("");
resulttext2.setText("");
try{
a1 = Double.parseDouble(paratext1.getText());
b1 = Double.parseDouble(paratext2.getText());
c1 = Double.parseDouble(paratext3.getText());
if ((a1 == 0)&&(b1 != 0)){
x1 = c1/b1;
resulttext1.setText(String.valueOf(x1));
}
if (a1 != 0){
if ((b1*b1-4*a1*c1)>=0){
sqrt = getsqrt(a1,b1,c1);
x1 = ((-1)*b1+sqrt)/(2*a1);
x2 = ((-1)*b1-sqrt)/(2*a1);
resulttext1.setText(String.valueOf(x1));
resulttext2.setText(String.valueOf(x2));
}
if ((b1*b1-4*a1*c1)<0){
sqrt = getsqrt(a1,b1,c1);
resulttext1.setText(String.valueOf((-1)*b1/(2*a1))+"+"+String.valueOf(sqrt/(2*a1))+"i");
resulttext2.setText(String.valueOf((-1)*b1/(2*a1))+"-"+String.valueOf(sqrt/(2*a1))+"i");
}
}
}catch(Exception ex){}
}
public double getsqrt(double x,double y,double z){
result = Math.sqrt(Math.abs(y*y-4*x*z));
return result;
}
}
jb.rar （51个子文件） 
实例01 untitled1 
untitled1.jpx.local 937B untitled1.jpx 3KB
untitled1.html 500B src untitled1 valia.jbx 679B valia.java 3KB java实例 untitled1 valia.class 4KB valia$1.class 616B valia$3.class 656B valia$2.class 656B dependency cache untitled1.dependency 2KB valia.html 424B doc untitled1 valia.html 2KB Thumbs.db 5KB
效果图.bmp 106KB 实例02 效果图.bmp 128KB whileexample whileexample.html 503B whileexample.jpx.local 950B bak whileexample whileexample.jpx 1KB src whileexample Applet1.java 2KB classes Applet1.html 434B dependency cache whileexample.dependency 2KB whileexample Applet1.class 3KB Applet1$1.class 651B 实例05 untitled2 untitled2.jpx.local 946B bak untitled2 untitled2.html 500B src untitled2 ifexample.java 4KB untitled2.jpx 1KB classes dependency cache untitled2.dependency 2KB untitled2 ifexample.class 5KB ifexample$1.class 682B ifexample.html 432B 效果图.bmp 74KB 实例04 untitled2 untitled2.jpx.local 951B bak untitled2 untitled2.html 500B src untitled2 stringsample.java 2KB f1.tif 354KB untitled2.jpx 1KB classes dependency cache untitled2.dependency 2KB untitled2 stringsample.class 3KB stringsample$1.class 700B stringsample.html 438B 效果图.bmp 113KB 实例03 ifexample bak ifexample src ifexample Applet1.java 2KB ifexample.jpx 1KB classes Applet1.html 428B dependency cache ifexample.dependency 2KB ifexample Applet1.class 3KB Applet1$1.class 670B ifexample.jpx.local 1KB ifexample.html 500B 效果图.bmp 89KB资源评论
