?? banktest.java
字號:
// initialization/BankTest.java
// TIJ4 Chapter Initialization, Exercise 11, page 177
// Modify the previous exercise so that finalize() will always be called.
class WebBank {
boolean loggedIn = false;
WebBank(boolean logStatus) {
loggedIn = logStatus;
}
void logOut() {
loggedIn = false;
}
protected void finalize() {
if(loggedIn)
System.out.println("Error: still logged in");
// Normally, you'll also call the base-class version:
// super.finalize();
}
}
public class BankTest {
public static void main(String[] args) {
WebBank bank1 = new WebBank(true);
WebBank bank2 = new WebBank(true);
new WebBank(true);
// Proper cleanup: log out of bank1 before going home:
bank1.logOut();
// Forget to logout of bank2 and unnamed new bank
// Attempts to finalize any missed banks:
System.out.println("Try 1: ");
System.runFinalization();
System.out.println("Try 2: ");
Runtime.getRuntime().runFinalization();
System.out.println("Try 3: ");
System.gc();
System.out.println("Try 4: ");
// using deprecated since 1.1 method:
System.runFinalizersOnExit(true);
}
}
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