大哥: class Japan implements Computable少了个大括号 public class Example extends Applet多了个大括号改成这样就行了 class Japan implements Computable { int xuehao; public int f(int x) { return 68; } public float g(float x,float y) { return x+y; } public void speak(String s) {
} }//*********少了这个,这个********public class Example extends Applet { China Li; Japan Henlu; public void init() { Li=new China(); Henlu=new Japan(); Li.xuehao=991; Henlu.xuehao=947; } public void paint(Graphics g) { g.drawString("xuehao:"+Li.xuehao+"从1到100求和"+Li.f(100),10,20); g.drawString("xuehao:"+Henlu.MAX1+Henlu.xuehao+"加法"+Henlu.f(100),10,20);
} } /****}**这个多出来了**/
import java.applet.*; import java.awt.*; interface Computable { int MAX1=100; void speak(String s); int f(int x); float g(float x,float y); }class China implements Computable { int xuehao; public int f(int x) { int sum=0; for(int i=1;i<=x;i++) {sum=sum+i;} return sum; } public float g(float x,float y) { return 6; } public void speak(String s) { } }class Japan implements Computable { int xuehao; public int f(int x) { return 68; } public float g(float x,float y) { return x+y; } public void speak(String s) {
} }public class Example extends Applet { China Li; Japan Henlu; public void init() { Li=new China(); Henlu=new Japan(); Li.xuehao=991; Henlu.xuehao=947; } public void paint(Graphics g) { g.drawString("xuehao:"+Li.xuehao+"从1到100求和"+Li.f(100),10,20); g.drawString("xuehao:"+Henlu.MAX1+Henlu.xuehao+"加法"+Henlu.f(100),10,20);
class Japan implements Computable少了个大括号
public class Example extends Applet多了个大括号改成这样就行了
class Japan implements Computable
{
int xuehao;
public int f(int x)
{
return 68;
}
public float g(float x,float y)
{
return x+y;
}
public void speak(String s)
{
}
}//*********少了这个,这个********public class Example extends Applet
{
China Li;
Japan Henlu;
public void init()
{
Li=new China();
Henlu=new Japan();
Li.xuehao=991;
Henlu.xuehao=947;
}
public void paint(Graphics g)
{
g.drawString("xuehao:"+Li.xuehao+"从1到100求和"+Li.f(100),10,20);
g.drawString("xuehao:"+Henlu.MAX1+Henlu.xuehao+"加法"+Henlu.f(100),10,20);
}
}
/****}**这个多出来了**/
import java.awt.*;
interface Computable
{
int MAX1=100;
void speak(String s);
int f(int x);
float g(float x,float y);
}class China implements Computable
{
int xuehao;
public int f(int x)
{
int sum=0;
for(int i=1;i<=x;i++)
{sum=sum+i;}
return sum;
}
public float g(float x,float y)
{
return 6;
}
public void speak(String s)
{
}
}class Japan implements Computable
{
int xuehao;
public int f(int x)
{
return 68;
}
public float g(float x,float y)
{
return x+y;
}
public void speak(String s)
{
}
}public class Example extends Applet
{
China Li;
Japan Henlu;
public void init()
{
Li=new China();
Henlu=new Japan();
Li.xuehao=991;
Henlu.xuehao=947;
}
public void paint(Graphics g)
{
g.drawString("xuehao:"+Li.xuehao+"从1到100求和"+Li.f(100),10,20);
g.drawString("xuehao:"+Henlu.MAX1+Henlu.xuehao+"加法"+Henlu.f(100),10,20);
}
}example 中