Java·´Éä3
1.2.5.MethodÀࣺ
Method´ú±íij¸öÀàµÄÒ»¸ö·½·¨£¬Ìṩ¹ØÓÚÀà»ò½Ó¿ÚÉϵ¥¶Àij¸ö·½·¨µÄÐÅÏ¢¡£Ëù·´Ó³µÄ·½·¨¿ÉÄÜÊÇÀà·½·¨»òʵÀý·½·¨£¨°üÀ¨³éÏó·½·¨£©¡£ Õâ¸öÀ಻ÄÑÀí½â£¬ËüÊÇÓÃÀ´·â×°·´ÉäÀà·½·¨µÄÒ»¸öÀà¡£
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public String getName()
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public Object invoke(Object obj,Object... args)
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String str="abc";
Method methodCharAt = String.class.getMethod("charAt",
int.class);
System.out.println(methodCharAt.invoke(str1, 1));
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н¨Ò»¸öÀàTestArgumentsÌṩmain·½·¨
public class TestArguments{
public static void main(String[] args){
for(String arg : args){
System.out.println(arg);
}
}
}
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String startingClassName = "TestArguments";
Method mainMethod =
Class.forName(startingClassName).getMethod("main",
String[].class);
mainMethod.invoke(null,
(Object)new String[]{"111","222","333"});
1.2.6.ArrayÀࣺ
Array¹¤¾ßÀàÓÃÓÚÍê³É¶ÔÊý×éµÄ·¢Éä²Ù×÷¡£
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´ú±íÊý×éµÄClassʵÀý¶ÔÏóµÄgetSuperclass£¨£©·½·¨·µ»ØµÄ¸¸ÀàΪObjectÀà¶ÔÓ¦µÄClass¡£
»ù±¾ÀàÐ͵ÄһάÊý×é¿ÉÒÔ±»µ±×÷ObjectÀàÐÍʹÓ㬲»Äܵ±×÷Object[]ÀàÐÍʹÓã»·Ç»ù±¾ÀàÐ͵ÄһάÊý×飬¼È¿ÉÒÔµ±×öObjectÀàÐÍʹÓã¬ÓÖ¿ÉÒÔµ±×öObject[]ÀàÐÍʹÓá£
Arrays.asList()·½·¨´¦Àíint[]ºÍString[]ʱµÄ²îÒì
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int [] a1 = new int[]{1,2,3};
int [] a2 = new int[4];
int[][] a3 = new int[2][3];
 
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Integer.toHexString(int i)
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Integer.toOctalString(int i)
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Integer.toBinaryString(int i)
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Integer.valueOf("FFFF",16).toString()
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Integer.valueOf("876",8).toString()
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public class RunExtraProgram {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
try {
Runtime.getRuntime().exec("D:\\Program Files\\TTPlayer\\TTPlayer.exe");
} catc ......
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Calendar time=Calendar.getInstance();
time.clear();
time.set(Calendar.YEAR,year); //year Ϊ int
time.set(Calendar.MONTH,i-1);//×¢Òâ,Calendar¶ÔÏóĬÈÏÒ»ÔÂΪ0
int day=time.getActualMaximum(Calendar ......