Java:Variable argument lists

class A {
}

public class NewVarArgs {

    static void printArray(Object... args) {
        for (Object obj : args) {
            System.out.print(obj + " ");
        }
        System.out.println();
    }

    public static void main(String[] args) {
        printArray(new Integer(67), new Double(78.0));
        printArray(67, 455.33f, 54.54);
        printArray("ads", "asdas", "asdasd");
        printArray(new A(), new A(), new A());
        printArray();//可以为空
    }
}

输出

67 78.0 
67 455.33 54.54 
ads asdas asdasd 
A@c17164 A@1fb8ee3 A@61de33 

另一个例子

public class OptionalTrailingArguments {
    static void f(int required,String...trailing){  //参数类型不一样
        System.out.print("required: "+required+" ");
        for(String s:trailing){
            System.out.print(s+" ");
        }
        System.out.println();
    }
    public static void main(String[]args){
        f(1,"one");
        f(2,"two","three");
        f(3);
    }
}

required: 1 one 
required: 2 two three 
required: 3