notepad编写java程序，分别写了两个类，一个类应用另一个类的对象，保存过后编译显示找不到符号； 我用notepad写JAVA代码，用DOS执行，写的一个类文...
\u8981\u7f16\u5199Java\u5e94\u7528\u7a0b\u5e8f\uff0c\u8be5\u7a0b\u5e8f\u5305\u542b\u4e24\u4e2a\u7c7b\uff0c\u4e00\u4e2a\u5706\u5f62\u7c7b\u3001\u4e00\u4e2a\u5706\u67f1\u4f53\u7c7b\u3002//\u521b\u5efa\u5706\u7684\u7c7b
public class round {
protected double radius;
protected double area;
public void setRadius(double radius) { //\u8bbe\u7f6e\u5706\u7684\u534a\u5f84
this.radius = radius;
}
public double getArea() { //\u6c42\u5706\u7684\u9762\u79ef
return 3.14*radius*radius;
}
}
//\u521b\u5efa\u7ee7\u627f\u81ea\u5706\u7684\u5706\u67f1\u4f53\u7c7b
public class cylindrical extends round{
private double height;
private double voluem;
public void setHeight(double height){ //\u8bbe\u7f6e\u5706\u67f1\u4f53\u7684\u9ad8
this.height = height;
}
public double getVoluem() { //\u6c42\u5706\u67f1\u4f53\u7684\u4f53\u79ef\uff0c\u534a\u5f84\u7ee7\u627f\u81ea\u5706\u7684\u7c7b\uff0c\u4e0d\u7528\u91cd\u590d\u5b9a\u4e49
return 3.14*radius*radius*height;
}
}
//\u4e3b\u51fd\u6570\u7c7b\uff08\u6d4b\u8bd5\u7c7b\uff09\uff1a
public class testMain {
public static void main(String[] args){
round round1 = new round();
cylindrical cylindrical1 = new cylindrical();
int n1;//\u5b9a\u4e49\u4e00\u4e2a\u6574\u578b\u6570n1
BufferedReader distream = new BufferedReader(new InputStreamReader(System.in));
System.out.println( "\u8bf7\u8f93\u5165\u5706\u7684\u534a\u5f84\uff1a");
n1=Integer.parseInt(distream.readLine());//\u8fdb\u884c\u8f93\u5165\uff0c\u5e76\u628a\u8f93\u5165\u7684\u6570\u5b58\u5165n1\u4e2d
round1.setRadius(n1); //\u5047\u5b9a\u8f93\u5165\u4e3a2.0
System.out.println("\u534a\u5f84\u4e3a"+n1+"\u65f6\uff0c\u5706\u7684\u9762\u79ef\u4e3a\uff1a"+round1.getArea());
round1.setRadius(1.0);//\u6ce8\u610f\uff0c\u6b64\u65f6\u7528\u5230\u7684\u5bf9\u8c61\u662f\u5706\u7684\u5bf9\u8c61\uff0c\u975e\u5706\u67f1\u4f53\u5bf9
//\u8c61\uff0c\u6240\u4ee5\u5706\u67f1\u4f53\u534a\u5f84\u4e3a\u96f6\uff0c\u4e0b\u9762\u8f93\u51fa\u7ed3\u679c\u4e5f\u4e3a0
cylindrical1.setHeight(1.0);
System.out.println("\u9ad8\u4e3a1\uff0c\u534a\u5f84\u4e3a1\u7684\u5706\u67f1\u4f53\u7684\u4f53\u79ef\u4e3a\uff1a"+cylindrical1.getVoluem());
cylindrical1.setRadius(1.0);
System.out.println("\u534a\u5f84\u4e3a1\u65f6\u5706\u7684\u9762\u79ef\u4e3a\uff1a"+round1.getArea());
System.out.println("\u6b64\u65f6\u7684\u5706\u67f1\u4f53\u4f53\u79ef\u4e3a\uff1a"+cylindrical1.getVoluem());
}
}
\u8f93\u51fa\u7ed3\u679c\uff1a
\u8bf7\u8f93\u5165\u5706\u7684\u534a\u5f84\uff1a2.0
\u534a\u5f84\u4e3a2\u65f6\uff0c\u5706\u7684\u9762\u79ef\u4e3a\uff1a12.56
\u9ad8\u4e3a1\uff0c\u534a\u5f84\u4e3a1\u7684\u5706\u67f1\u4f53\u7684\u4f53\u79ef\u4e3a\uff1a0.0
\u534a\u5f84\u4e3a1\u65f6\u5706\u7684\u9762\u79ef\u4e3a\uff1a3.14
\u6b64\u65f6\u7684\u5706\u67f1\u4f53\u4f53\u79ef\u4e3a\uff1a3.14
\u4f60\u6309ctrl+S\u4fdd\u5b58\u4e86\u5417
假设ClassA引用ClassB.那么：1， ClassA里要import ClassB
2，先编译ClassB, 再编译ClassA，最后运行含main函数的类。
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