基础题,请进
wwss123456

[解决办法]
lianxi t=new lianxi();
lianxi.Dec dec=t.new Dec();
内部类创建错了~
[解决办法]
public class lianxi {
public static void main(String[] args){
double d=1.23;
lianxi b1 = new lianxi();
Dec dec= b1.new Dec();
dec.decrement(d);
System.out.println(d);
}
class Dec{
public Dec(){};
public double decrement(double d){
return d=d-1;
}


}
就没了，输出：
1.23

}

[解决办法]
public class lianxi {
public static void main(String[] args){
double d=1.23;
lianxi b1 = new lianxi();
Dec dec= b1.new Dec();
dec.decrement(d);
System.out.println(d);
}
class Dec{
public Dec(){};
public double decrement(double d){
return d=d-1;
}


}

}
[解决办法]

Java code

public class lianxi {    public static void main(String[] args) {        double d = 1.23;        lianxi l = new lianxi();//先实例一个lianxi对象        Dec dec = l.new Dec();        dec.decrement(d);        System.out.println(d);    }    class Dec {        public Dec() {        }        public double decrement(double d) {            return d = d - 1;        }    }}