^_^.这样改一下就可以了!
class Book {
boolean checkedOut=false ;
Book(boolean checkOut) {
checkedOut = checkOut;
} void checkIn() {
checkedOut = false;
} public void finalize() {
if(checkedOut)
System.out.println("Error: checked out");
}
}public class TerminationCondition {
public static void main(String[] args) {
Book novel=new Book(true);
novel=null;
System.gc();
}
}
class Book {
boolean checkedOut=false ;
Book(boolean checkOut) {
checkedOut = checkOut;
} void checkIn() {
checkedOut = false;
} public void finalize() {
if(checkedOut)
System.out.println("Error: checked out");
}
}public class TerminationCondition {
public static void main(String[] args) {
Book novel=new Book(true);
novel=null;
System.gc();
}
}
解决方案 »
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