Java类型转换前一般有三种方式进行类型检查

• isAssignableFrom
• isInstance
• instanceof

isAssignableFrom

X.class.isAssignableFrom(Y.class)

If X and Y are the same class, or X is Y's super class or super interface, return true, otherwise, false

isInstance

X.class.isInstance(y)

Say y is an instance of class Y, if X and Y are the same class, or X is Y's super class or super interface, return true, otherwise, false.

instanceof

x instanceof X

For instanceof you need to know the exact class X at compile time.