java构造函数

 class Chongzai {    public static void main(String[] args)     {     int i1=3,i2=5;              //byte,short,char->int->long->float->double     char c1='a',charc3='b';     float f1=3.1f,f2=4.1f;     double d1=2.5,d2=3.8;     System.out.println(add(i1,i2));     System.out.println(add(c1,i1));     System.out.println(add(i1,f1));     System.out.println(add(f1,d2));     System.out.println(add(d1,i2));     System.out.println("'a'="+'a');    }    static int add(int i,int j)      {    return i+j;    }     static double add(double i,double j)     {    return i+j;    }}