Java-instanceof summary code example

What you learn on paper is shallow, but you know you have to do it in detail --Lu You Ask the canal how clear it is to have a source of living water --Zhu Xi

instanceof is actually a binary operator in Java, used to determine the object## on the left #Whether it is an instance of the specific class on the right or its subclass, return boolean type data. Generally, when using non-generic collections (List, set, etc.), instanceof is often used. Since collections can store various objects, they generally need to be read when reading. corresponding judgment.

instanceof instance:

A {


}

B  A{

}

Hello {

(String[] args) {
A a=A()B b=B()A aa=(a A)
        {
            System..println()}{
            System..println()}
(b A){
            System..println()}	else{
            System..println()}
(aa A)
        {
            System..println()}{
            System..println()}
    }

}

Run result:

true
true
false

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