instanceof运算符
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interface A {}class B implements A {}class C extends B {}public class Iinstanceof { public static void main(String[] args) { A ab = new B(); A ac = new C(); B bc = new C(); B bb = new B(); C cc = new C(); // 对象实现一个接口,用这个对象和这个接口进行instanceof判断,都为true。 System.out.println("ab instanceof A=" + (ab instanceof A)); System.out.println("ac instanceof A=" + (ac instanceof A)); System.out.println("bc instanceof A=" + (bc instanceof A)); System.out.println("bb instanceof A=" + (bb instanceof A)); System.out.println("cc instanceof A=" + (cc instanceof A)); // 对象和父类进行instanceof判断,都为true System.out.println("ab instanceof B=" + (ab instanceof B)); System.out.println("ac instanceof B=" + (ac instanceof B)); System.out.println("bc instanceof B=" + (bc instanceof B)); System.out.println("bb instanceof B=" + (bb instanceof B)); System.out.println("cc instanceof B=" + (cc instanceof B)); // 对象和他的子类进行instanceof判断为false System.out.println("ab instanceof C=" + (ab instanceof C)); System.out.println("ac instanceof C=" + (ac instanceof C)); System.out.println("bc instanceof C=" + (bc instanceof C)); System.out.println("bb instanceof C=" + (bb instanceof C)); System.out.println("cc instanceof C=" + (cc instanceof C)); }}
ab instanceof A=trueac instanceof A=truebc instanceof A=truebb instanceof A=truecc instanceof A=trueab instanceof B=trueac instanceof B=truebc instanceof B=truebb instanceof B=truecc instanceof B=trueab instanceof C=falseac instanceof C=truebc instanceof C=truebb instanceof C=falsecc instanceof C=true
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