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public class JavaDemo01
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public static void main(String args[])
{
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System.out.println("Hello MLDN .") ;
System.out.println("Hello LXH .") ;
}
}; 
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public class JavaDemo02
{
// Ö÷·½·¨
public static void main(String args[])
{
// ±äÁ¿¶¨ÒåµÄ¸ñʽ£º±äÁ¿µÄÀàÐÍ ±äÁ¿µÄÃû³Æ = ³õÖµ ;
int x = 30 ;
int y = 20 ;
// ÐÞ¸ÄxµÄÄÚÈÝ£º±äÁ¿Ãû³Æ = ÐÂÖµ
x = 50 ;
// ´òÓ¡ x + yµÄÖµ
System.out.println(x + y) ;
}
}; 
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public class JavaDemo04
{
// Ö÷·½·¨
public static void main(String args[])
{
// ¶¨ÒåPI
float PI = 3.1415926f ;
// ¶¨Òå°ë¾¶
float r = 3.5f ;
// Çó³öÔ²µÄÃæ»ý
System.out.println(PI*r*r) ;
}
}; 
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public class Max_Min
{
public static void main(String args[])
{
//intÊý¾ÝÀàÐ͵ĴóС
System.out.println("Int Min&Max"+": "+Integer.MIN_VALUE+" ~ "+Integer.MAX_VALUE);
//shortÊý¾ÝÀàÐ͵ĴóС
System.out.println("Short Min&Max"+": "+Short.MIN_VALUE+" ~ "+Short.MAX_VALUE);
//byteÊý¾ÝÀàÐ͵ĴóС
System.out.println("Byte Min&Max"+": "+Byte.MIN_VALUE+" ~ "+Byte.MAX_VALUE);
//longÊý¾ÝÀàÐ͵ĴóС
System.out.println("Long Min&Max"+": "+Long.MIN_VALUE+" ~ "+Long.MAX_VA


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