public interface A {
public abstract long fact(int m);
public abstract long intPower(int m,int n);
public abstract boolean findFactor(int m,int n);
}
public class B implements <A>{//18行
int m;
int n;
public long fact(int m){
this.m = m;
int i;
double x = 1;
for(i = 1;i <= m;i++){
x *= i;
System.out.println(m+"的阶乘是："+x);
}
}
public long intPower(int m,int n){
this.m = m;
this.n = n;
double y;
if(n > 0){
y = m*intPower(int m, int n-1);//36行
}
System.out.println(m+"的n次方是："+y);
}
public boolean findFactor(int m,int n){
this.m = m;
this.n = n;
if(m <= n && n%m==0){
System.out.println("m是n的因子");
}
if(n <= m && m%n ==0){
System.out.println("n是m的因子");
}
}
public B(int m,int n){
this.m = m;
this.n = n;
}
public static void main (String[] args) {
B b = new B(2,4);
b.fact(2);
}
}
错误: 非法的类型开始 18行
错误: 非法的表达式开始 18行
错误: 需要 '.class' 36行
错误: 需要';' 36行
错误: 需要';' 36行
------解决方案--------------------
public class B implements A{//18行
y = m*intPower(m, n-1);//36行//这里是 执行方法，又不是定义，怎么能有int？
------解决方案--------------------
改了4，5个错误。
1.有返回类型却无返回值
2.概念模糊，逻辑也没有描述清楚。
- Java code
interface A { public abstract long fact(int m); public abstract long intPower(int m, int n); public abstract boolean findFactor(int m, int n);}public class B implements A {//implement <A>是什么意思？ int m; int n; public long fact(int m) {//阶乘 this.m = m; int i; long x = 1; for (i = 1; i <= m; i++) { x *= i; } System.out.println(m + "的阶乘是：" + x);//放外面 return x; } public long intPower(int m, int n) { this.m = m; this.n = n; long y = 0; if(n==0){//结束条件 y = 1; } else if (n > 0){ y = m * intPower(m, n - 1);//调用方法，递归 } System.out.println(m + "的"+n+"次方是：" + y); return y; } public boolean findFactor(int m, int n) {//感觉逻辑有些问题。 boolean flag = false; this.m = m; this.n = n; if (m <= n && n % m == 0) { System.out.println("m是n的因子"); flag = true; } if (n < m && m % n == 0) { System.out.println("n是m的因子"); flag= true; } return flag; } public B(int m, int n) { this.m = m; this.n = n; } public static void main(String[] args) { B b = new B(2, 4); b.fact(2); b.intPower(2,4); }}
------解决方案--------------------
interface A
{
/**
* 是接口，为什么还用静态方法呢？
* @param m
* @return
*/
public long fact(int m);
public long intPower(int m, int n);
public boolean findFactor(int m, int n);
}
public class B implements A
{
int m;
int n;
public long fact(int m)
{
this.m = m;
int i;
long x = 1;
for (i = 1; i <= m; i++)
{
x *= i;
}
System.out.println(m + "的阶乘是：" + x);