文件 tancs.java:import java.applet.*;
public class tancs extends Applet
{
public void init()
{
System.out.println(getCodeBase());
}
public static void main(String args [])
{
tancs tan1=new tancs();
tan1.init();
}
}编译正常,运行时报错:
E:\execise>java tancs
Exception in thread "main" java.lang.NullPointerException
at java.applet.Applet.getCodeBase(Applet.java:136)
at tancs.init(tancs.java:6)
at tancs.main(tancs.java:11)帮忙看看!!
public class tancs extends Applet
{
public void init()
{
System.out.println(getCodeBase());
}
public static void main(String args [])
{
tancs tan1=new tancs();
tan1.init();
}
}编译正常,运行时报错:
E:\execise>java tancs
Exception in thread "main" java.lang.NullPointerException
at java.applet.Applet.getCodeBase(Applet.java:136)
at tancs.init(tancs.java:6)
at tancs.main(tancs.java:11)帮忙看看!!
解决方案 »
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