範例

public class ClassA {
Double d;
Float f;
public void methodA() {

boolean b = d == Double.NaN;
// ...
boolean c = f == Float.NaN;
// ...
}

}
解決方案 請利用 isNaN() 來檢查變數是否包含 NaN 值
範例

public class ClassA {
Double d;
Float f;
public void methodA() {

boolean b = Double.isNaN(d);
// ...
boolean c = Float.isNaN(f);
// ...
}

}