SCJP: java exerciese 1
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 | //TestCollect .java package com.test; public class TestCollect { private String name; private int age; public String getName() { return name; } public void setName(String name) { this .name = name; } public int getAge() { return age; } public void setAge( int age) { this .age = age; } @Override protected void finalize() throws Throwable { System.out.println( "Object Finalize:" + this .hashCode()); super .finalize(); } } //TestArgs.java package com.test; import java.util.Properties; public class TestArgs { public static void main(String... args) { char ch= '1' ; //two ways: char [] var_name; char var_name[]; different //char chs[]={'\u0030','\u0031'},chss; //48,49 chs:Array, chss:char char [] chs={ '\u0030' , '\u0031' },chss; //48,49 chs:Array, chss:Array System.out.println(( int )(ch)); System.out.println((chs[ 1 ])); //1 //chss='b'; //System.out.println(chss); /*System.getProperties().list(System.out); //output system properties to stdout. System.out.println(System.getProperty("Path", "bbb"));*/ /* Test System.gc(); TestCollect tc=new TestCollect(); tc.setAge(23); tc.setName("wcg"); System.out.println(tc.getAge()); tc=null; //obj ref cnt is 0, wait for collect... //System.gc(); Runtime.getRuntime().gc(); System.out.println("Please enter a int:"); Scanner scan=new Scanner(System.in); int i = scan.nextInt(9); //radix:9,数制(11)9=(10)10 System.out.println(i); */ /* String s=args[0]; System.out.println(s); System.out.println("Length:"+args.length); for(String arg:args){ System.out.println(arg); } Say(); */ } } |
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