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import org.jetbrains.annotations.Nullable;
class Foo {
@Nullable Object data;
void checkNotNullAndUse(Foo f) {
if (f.data != null) {
System.out.println(f.data.hashCode());
}
}
void checkNullAndReturn(Foo f) {
if (f.data == null) {
return;
}
System.out.println(f.data.hashCode());
}
void warnWhenWrongCheck() {
if (data != null) {
return;
}
System.out.println(<warning descr="Method invocation 'data.hashCode()' may produce 'java.lang.NullPointerException'">data.hashCode()</warning>);
System.out.println(data.hashCode());
}
void warnWhenNotCheckedOnce(Foo f) {
System.out.println(<warning descr="Method invocation 'f.data.hashCode()' may produce 'java.lang.NullPointerException'">f.data.hashCode()</warning>);
System.out.println(f.data.hashCode());
}
void warnWhenNotCheckedThisOnce() {
System.out.println(<warning descr="Method invocation 'data.hashCode()' may produce 'java.lang.NullPointerException'">data.hashCode()</warning>);
System.out.println(data.hashCode());
}
void dontWarnWhenDoubleChecked(Foo f) {
if (f.data == null) {
return;
}
if (f.data == null) {
return;
}
System.out.println(f.data.hashCode());
}
void dontWarnWhenDoubleChecked_This_Synchronized() {
if (data == null) {
return;
}
synchronized (this) {
if (data == null) {
return;
}
}
System.out.println(data.hashCode());
}
void dontWarnWhenDoubleChecked_This_WithMethodCall() {
if (data == null) {
return;
}
System.out.println(data.hashCode());
if (data == null) {
return;
}
System.out.println(data.hashCode());
}
}
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