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³ÌÐòÇåµ¥£ºPromote.java
class Promote
{
public static void main(String args[])
{
byte b = 50;
char c = 'a';
short s = 1024;
int i = 50000;
float f = 5.67f;
double d = .1234;
double result = (f * b) + (i / c) - (d * s);
System.out.println((f * b) + " + " + (i / c) + " - " + (d * s));
System.out.println("result = " + result);
}
}
¡¶Java¾ÍÒµÅàѵ½Ì³Ì¡·P35Ô´Âë
³ÌÐòÇåµ¥£ºTestScope.java
public class TestScope
{
public static void main(String[] args)
{
int x = 12;
{
int q = 96; // xºÍq¶¼¿ÉÓÃ
System.out.println("x is "+x);
System.out.println("q is "+q);
}
q = x; /* ´íÎóµÄÐУ¬Ö»ÓÐx¿ÉÓ㬠q ³¬³öÁË×÷ÓÃÓò·¶Î§ */
System.out.println("x is "+x);
}
}
¡¶Java¾ÍÒµÅàѵ½Ì³Ì¡·P37Ô´Âë
³ÌÐòÇåµ¥£ºTestVar.java
public class TestVar
{
public static void main(String [] args)
{
int x;//Ó¦¸ÄΪint x=0;
x=x+1; //Õâ¸öxÓÉÓÚûÓгõʼ»¯£¬±àÒë»á±¨´í¡£
System.out.println("x is "+x);
}
}
³ÌÐòÇåµ¥£ºFunc1.java
public class Func1
{
public static void main(String [] args)
{
/* ÏÂÃæÊÇ´òÓ¡³öµÚÒ»¸ö¾ØÐεijÌÐò´úÂë*/
for(int i=0;i<3;i++)
{
for(int j=0;j<5;j++)
{
System.out.print("*");
&
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