关于java最基本的环境配置问题

donwmufromdying 2006-04-14 07:26:25

我设置了classpath，编译也正常，java Music5就报异常
java.lang.NoClassDefFoundError 不清楚！
源码转自thinking in java
//: c08:music5:Music5.java// Interfaces.
import java.util.*;

interface Instrument {
// Compile-time constant:
int i = 5; // static & final// Cannot have method definitions:
void play(); // Automatically public
String what();
void adjust();
}

class Wind implements Instrument {
public void play() {
System.out.println("Wind.play()");
}
public String what() { return "Wind"; }
public void adjust() {}
}

class Percussion implements Instrument {
public void play() {
System.out.println("Percussion.play()");
}
public String what() { return "Percussion"; }
public void adjust() {}
}

class Stringed implements Instrument {
public void play() {
System.out.println("Stringed.play()");
}
public String what() { return "Stringed"; }
public void adjust() {}
}

class Brass extends Wind {
public void play() {
System.out.println("Brass.play()");
}
public void adjust() {
System.out.println("Brass.adjust()");
}
}

class Woodwind extends Wind {
public void play() {
System.out.println("Woodwind.play()");
}
public String what() { return "Woodwind"; }
}

public class Music5 {
// Doesn't care about type, so new types// added to the system still work right:
static void tune(Instrument i) {
// ...
i.play();
}
static void tuneAll(Instrument[] e) {
for(int i = 0; i < e.length; i++)
tune(e[i]);
}
public static void main(String[] args) {
Instrument[] orchestra = new Instrument[5];
int i = 0;
// Upcasting during addition to the array:
orchestra[i++] = new Wind();
orchestra[i++] = new Percussion();
orchestra[i++] = new Stringed();
orchestra[i++] = new Brass();
orchestra[i++] = new Woodwind();
tuneAll(orchestra);
}
} ///:~

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