常见错误合集

1. null 转基本类型

null 转基本类型

@Data
@NoArgsConstructor
@AllArgsConstructor
static class OneClass {
    private Double value;
}

@Test
public void nullToPrimitive() {
    OneClass oneClass = new OneClass(1.0);
    double value = oneClass.getValue();
    System.out.println(value);
    OneClass oneClass2 = new OneClass();
    value = oneClass2.getValue();
    System.out.println(value);
}

null指针异常

未完待续……