标签：instanceof System Student println true out
//Object > String
//Object > Person > Student
//Object > Person > Teacher
//System.out.println(X instanceof Y);//能不能编译通过取决于X和Y之间是否存在父子关系
Object object = new Student();
System.out.println(object instanceof Student);//true
System.out.println(object instanceof Person);//true
System.out.println(object instanceof Object);//true
System.out.println(object instanceof Teacher);//false
System.out.println(object instanceof String);//false
System.out.println("============================================");
Person person = new Student();
System.out.println(person instanceof Student);//true
System.out.println(person instanceof Person);//true
System.out.println(person instanceof Object);//true
System.out.println(person instanceof Teacher);//false
//System.out.println(person instanceof String); //编译报错！
System.out.println("============================================");
Student student = new Student();
System.out.println(student instanceof Student);//true
System.out.println(student instanceof Person);//true
System.out.println(student instanceof Object);//true
//System.out.println(student instanceof Teacher);//编译报错！
//System.out.println(student instanceof String);//编译报错！
标签：instanceof,
System,
Student,
println,
true,
out
From： https://www.cnblogs.com/cyyyds/p/16942831.html