函数多个参数

public class ArgsDemo {
    public static void main(String[] args) {
        int a = 10;
        int b = 20;
        add(a, b);

        int c = 30;

        add(a, b, c);

        System.out.println(addArgs());

        System.out.println(addArgs(a));

        System.out.println(addArgs(a, b));

        System.out.println(addArgs(a, b, c));

        System.out.println(addArgs("结果：", b, c));
    }

    // 有0或多个参数，参数在使用时当作数组
    private static int addArgs(int... s) {
        // System.out.println(s.length);

        int count = 0;
        for (int i = 0; i < s.length; i++) {
            count += s[i];
        }

        return count;
    }

    // 可变长参数之后不能在跟参数,一个方法只能有一个可变参数
    private static void addArgs(boolean b,boolean... booleans/* ,int... s */) {

    }

    // 至少有两个参数
    private static int addArgs(int a, int b, int... s) {
        System.out.println("至少有两个参数");

        int count = a + b;
        for (int i = 0; i < s.length; i++) {
            count += s[i];
        }

        return count;
    }

    // 有1个或多个参数
    private static String addArgs(String str, int... is) {

        int count = 0;
        for (int i = 0; i < is.length; i++) {
            count += is[i];
        }

        return str + count;
    }

    private static int add(int a, int b, int c) {
        return a + b + c;
    }

    private static int add(int a, int b) {
        return a + b;
    }
}