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The constructor for LicenseManager initializes licenseMap with a demo license key which is meant to be kept secret. The license key is hardcoded hard-coded for illustrative purposes and should ideally be read from an external configuration file that stores its encrypted version; see MSC66-JG. Store passwords using a hash function for more information. The LicenseType class provides overridden implementations of equals() and hashCode() methods.
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This noncompliant code example consists of a Widget class and a LayoutManager class containing a set of widgets;:
| Code Block | ||
|---|---|---|
| ||
public class Widget {
private int noOfComponents;
public Widget(int noOfComponents) {
this.noOfComponents = noOfComponents;
}
public int getNoOfComponents() {
return noOfComponents;
}
public final void setNoOfComponents(int noOfComponents) {
this.noOfComponents = noOfComponents;
}
public boolean equals(Object o) {
if (o == null || !(o instanceof Widget)) {
return false;
}
Widget widget = (Widget) o;
return this.noOfComponents == widget.getNoOfComponents();
}
@Override
public int hashCode() {
int res = 31;
res = res * 17 + noOfComponents;
return res;
}
}
public class LayoutManager {
private Set<Widget> layouts = new HashSet<Widget>();
public void addWidget(Widget widget) {
if (!layouts.contains(widget)) {
layouts.add(widget);
}
}
public int getLayoutSize() {
return layouts.size();
}
} |
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In this noncompliant code example, class Worker and its subclass SubWorker each contain a startThread()method intended to start a thread.:
| Code Block | ||
|---|---|---|
| ||
public class Worker implements Runnable {
Worker() { }
public void startThread(String name) {
new Thread(this, name).start();
}
@Override
public void run() {
System.out.println("Parent");
}
}
public class SubWorker extends Worker {
@Override
public void startThread(String name) {
super.startThread(name);
new Thread(this, name).start();
}
@Override
public void run() {
System.out.println("Child");
}
} |
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This compliant solution modifies the SubWorker class and removes the call to super.startThread(). :
| Code Block | ||
|---|---|---|
| ||
public class SubWorker extends Worker {
@Override
public void startThread(String name) {
new Thread(this, name).start();
}
// ...
} |
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