编辑代码

public class MyOne{
    public static void main(String[]args){
        int a=12;
        char b='d';
        double c=23.65d;
        float d=34.65f;
        System.out.println("a="+a);
        System.out.println("b="+b);
        System.out.println("c="+c);
        System.out.println("d="+d);
    }
}