NumberFormat nf = new DecimalFormat("0.00");
double dVer = Double.parseDouble(verLabelStr);
dVer = dVer+ 1.00;
return nf.format(dVer);
double dVer = Double.parseDouble(verLabelStr);
dVer = dVer+ 1.00;
return nf.format(dVer);
public class Student{
private Comparable name = null;
private Number value = null;
public void setValue(Comparable name,Number value){
this.name = name;
this.value = value;
} public Number getValue() {
return this.value;
}}可以适应用户任意输入得数字类型,请问怎么实现getValue转换操作,也就是怎么实现,抽象类怎么实现向下转型?