How to use @SuppressWarnings in Java?

Concept

1. Indicates suppressing warnings. The purpose of this annotation is to ignore warning messages.

2. The function is to tell the compiler to ignore the specified warning, so that the warning message does not appear after the compilation is completed.

Methods

deprecation, ignore obsolete

rawtypes, ignore type safety

unused, ignore unused

unchecked, ignore security checks

null, ignore empty

all, ignore all

instances

//#3 抑制警告
// serial : 实现序列号接口，但没有生产序列号
@SuppressWarnings("serial")class Parent1_4 implements java.io.Serializable{
//null：空指针
@SuppressWarnings("null")
public void init(){
     //rawtypes：类型安全，没有使用泛型
     //unused : 不使用
    @SuppressWarnings({ "rawtypes", "unused" })
    List list = new ArrayList();
    String str = null;
    str.toString();
     }
}

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