Example
public class
ClassA {
private
ClassB b;
public void
aMethod () {
getB().useB();
}
public
ClassB getB () {
return b;
}
}
Solution
In the above example, there is no opportunity for b to be instantiated. It will be null; a NullPointerException will result if aMethod() is invoked. To fix, instantiate b or create a method to allow for its instantiation.
public class
ClassA {
private
ClassB b;
public void
aMethod () {
b.useB();
}
public
ClassB getB () {
return b;
}
public void
setB (ClassB b) {
this
.b = b;
}
}