编译期错误:如果用sun公司的源文件,就可以编译;如果是自己新建NOTE就会出现如下面这样的等等编译错误。一直都没搞明白,求各位好心的哥哥姐姐们照顾一下我这个初学都吧!c:\javapak> javac music5.java
music5.java:6:cannot find symbol
symbol : class string
location: class instrument
public abstract string what();
1 error源文件:
// A 1d array
import java.util.* ;abstract class instrument {
int i;
public abstract void play() ;
public string what() {
return "instrument" ;
}
public abstract void adjust() ;
}class wind extends instrument {
public void play() {
system.out.println("wind.play()") ;
}
public string what(){ return "wind" ; }
public void adjust(){}
}class percussion extends instrument {
public void play() {
system.out.println("percussion.play()");
}
public string what() { return "percussion" ; }
public void adjust() {}
}class stringed extends 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 music4 {
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;
orchestra[i++] = new wind();
orchestra[i++] = new percussion();
orchestra[i++] = new stringed();
orchestra[i++] = new brass();
orchestra[i++] = new woodwind();
tuneall(orchestra);
}}
music5.java:6:cannot find symbol
symbol : class string
location: class instrument
public abstract string what();
1 error源文件:
// A 1d array
import java.util.* ;abstract class instrument {
int i;
public abstract void play() ;
public string what() {
return "instrument" ;
}
public abstract void adjust() ;
}class wind extends instrument {
public void play() {
system.out.println("wind.play()") ;
}
public string what(){ return "wind" ; }
public void adjust(){}
}class percussion extends instrument {
public void play() {
system.out.println("percussion.play()");
}
public string what() { return "percussion" ; }
public void adjust() {}
}class stringed extends 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 music4 {
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;
orchestra[i++] = new wind();
orchestra[i++] = new percussion();
orchestra[i++] = new stringed();
orchestra[i++] = new brass();
orchestra[i++] = new woodwind();
tuneall(orchestra);
}}
int i;
public abstract void play() ;
public String what() {
return "instrument" ;
}
public abstract void adjust() ;
}class wind extends instrument {
public void play() {
System.out.println("wind.play()") ;
}
public String what(){ return "wind" ; }
public void adjust(){}
}class percussion extends instrument {
public void play() {
System.out.println("percussion.play()");
}
public String what() { return "percussion" ; }
public void adjust() {}
}class stringed extends 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 {
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;
orchestra[i++] = new wind();
orchestra[i++] = new percussion();
orchestra[i++] = new stringed();
orchestra[i++] = new brass();
orchestra[i++] = new woodwind();
tuneall(orchestra);
}}