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public class PassValue{
static void exchange(int a, int b){//¾²Ì¬·½·¨£¬½»»»a,bµÄÖµ
int temp;
temp = a;
a = b;
b = temp;
}
public static void main(String[] args){
int i = 10;
int j = 100;
System.out.println("before call: " + "i=" + i + "\t" + "j = " + j);//µ÷ÓÃǰ
exchange(i, j); //Öµ´«µÝ£¬main·½·¨Ö»Äܵ÷Óþ²Ì¬·½·¨
System.out.println("after call: " + "i=" + i + "\t" + "j = " + j);//µ÷Óúó
}
}
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before call: i = 10 j = 100
after call: i = 10 j = 100
˵Ã÷£ºµ÷ÓÃexchange(i, j)ʱ£¬Êµ¼Ê²ÎÊýi£¬j·Ö±ð°ÑÖµ´«µÝ¸øÏàÓ¦µÄÐÎʽ²ÎÊýa£¬b,ÔÚÖ´Ðз½·¨exchange()ʱ£¬ÐÎʽ²ÎÊýa£¬bµÄÖµµÄ¸Ä±ä²»Ó°Ïìʵ¼Ê²ÎÊýiºÍjµÄÖµ£¬iºÍjµÄÖµÔÚµ÷ÓÃǰºó²¢Ã»¸Ä±ä¡£
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class Book{
String name;
private folat price;
Book(String n, float ){ //¹¹Ôì·½·¨
name = n;
price = p;
}
static void change(Book a_book, String n, float p){ //¾²Ì¬·½·¨£¬¶ÔÏó×÷Ϊ²ÎÊý
a_book.name = n
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System.currentTimeMillis()£º¿ÉÒÔÌáÈ¡µ½µ±Ç°Ê±¼äµÄºÁÃëÊý£¬²úÉúÒ»¸öµ±Ç°µÄºÁÃ룬Õâ¸öºÁÃëÆäʵ¾ÍÊÇ×Ô1970Äê1ÔÂ1ÈÕ0ʱÆðµÄºÁÃëÊý¡£
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long start = System.currentTimeMillis();
// ÕâÀï¿ÉÒÔ¼ÓÉÏÄãÒªÖªµÀµÄ·½·¨ÔËÐеÄʱ¼ä£¡£¡
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Executing a CommandSee also e90 Reading Output from a Command.
try {
// Execute a command without arguments
String command = "ls";
Process child = Runtime.getRuntime().exec(command);
// Execute a command with an argument
command = "ls /tmp"; ......
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