| 发表于：2007-04-19 21:18:10 楼主 |
//filename: people_test.java
//定义people类
class people{
public people（){
height = 0;
weight = 0;
}
public double height,weight;
public void speak_hello（){
system.out.println（ "hello! ");
}
public void average_height（){
system.out.println（height);
}
public void average_weight（){
system.out.println（weight);
}
}
//定义china_people
class china_people extends people{
public void china_gongfu（){
system.out.println（ "坐如钟，站如松，睡如弓 ");
}
public void speak_hello（){
system.out.println（ "你好，吃饭了吗 ");
}
public void average_height（){
this.height = 173.0;
system.out.println（ "中国人的平均身高: "+height+ "厘米 ");
}
public void average_weight（){
this.weight = 67.34;
system.out.println（ "中国人的平均体重: "+weight+ "公斤 ");
}
}
//定义american_people
class american_people extends people{
public void american_boxing（){
system.out.println（ "直拳、钩拳 ");
}
public void speak_hello（){
system.out.println（ "how do you do ! ");
}
public void average_height（){
this.height = 188.0;
system.out.println（ "american average height: "+height+ " cm ");
}
public void average_weight（){
this.weight = 80.23;
system.out.println（ "american average weight: "+weight+ " kg ");
}
}
//定义beijing_people
class beijing_people extends people{
public void beijin_opera（){
system.out.println（ "京剧术语 ");
}
public void speak_hello（){
system.out.println（ "您好 ");
}
public void average_height（){
this.height = 176.0;
system.out.println（ "北京人的平均身高: "+height+ "厘米 ");
}
public void average_weight（){
this.weight = 67.0;
system.out.println（ "北京人的平均体重: "+weight+ "公斤 ");
}
}
//主类
public class people_test {
public static void main（string[] args) {
china_people cp = new china_people（);
american_people ap = new american_people（);
beijing_people bp = new beijing_people（);
cp.speak_hello（);
ap.speak_hello（);
bp.speak_hello（);
cp.average_height（);
ap.average_height（);
bp.average_height（);
cp.average_weight（);
ap.average_weight（);
bp.average_weight（);
cp.china_gongfu（);
ap.american_boxing（);
bp.beijin_opera（);
}
}
==========================================================
为什么多次编译有不同的结果？？（多次出现，非偶然）
在csdn搜了一下好像很多人都遇到过结果1的情况，请高手解释一下
结果1（错误）
--------------------configuration: <default> --------------------
java.lang.nosuchmethoderror: main
exception in thread "main "
process completed.
结果2（正确）
--------------------configuration: <default> --------------------
你好，吃饭了吗
how do you do !
您好
中国人的平均身高:173.0厘米
american average height: 188.0 cm
北京人的平均身高:176.0厘米
中国人的平均体重:67.34公斤
american average weight: 80.23 kg
北京人的平均体重:67.0公斤
坐如钟，站如松，睡如弓
直拳、钩拳
京剧术语
process completed.
=============================================================
如果结果中文出现乱码请先参照下面：
jcreator 4中文设置：
菜单：configure --> options --> jdk tools --> compiler，选中 <default> ，然后选edit，parameters里面，最前面添加：-encoding utf-8。
parameters原来的默认值为：-classpath "$[classpath] " -d "$[outputpath] " $[modjavafiles]
修改后为：
-encoding utf-8 -classpath "$[classpath] " -d "$[outputpath] " $[modjavafiles] |
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