开发测试类2
--从文件里面按行读取数据
public class Testbyte { /** * @param args * @throws FileNotFoundException */ public static void main(String[] args) throws FileNotFoundException { File f = new File("C:\\11.txt"); BufferedReader bf = new BufferedReader(new FileReader(f)); Scanner sc=new Scanner(bf); //Scanner sc=new Scanner(new FileReader("c:\\22.txt")); System.out.println(sc.toString()); String line=null; while((sc.hasNextLine()&&(line=sc.nextLine())!=null)){ if(!sc.hasNextLine()) System.out.println(line); } } }
--Continue用法
public class TestContinue { /** * @param args */ public static void main(String[] args) { for(int i=0;i<10;i++){ if(i==5){ continue; } System.out.println(i); } int a="2222".compareTo("8111"); System.out.println(a); } }
--在catch里面return也是可以的
public class TestExcp { /** * @param args */ public static void main(String[] args) { String q=testExcp(); System.out.println(q); } private static String testExcp(){ String a=null; try{ a.equals("1"); }catch (Exception e) { return "1"; } return "12"; } }
--finally在return之后执行
public class TestFinally { /** * @param args */ public static void main(String[] args) { test(); } private static String test(){ try{ System.out.println("1111"); return test1(); }catch (Exception e) { // TODO: handle exception } finally{ System.out.println("22222"); } return null; }
private static String test1(){ System.out.println("return out"); return null; } }
public class TestJson { /** * @param args * @throws IOException */ public static void main(String[] args) throws IOException { File file=new File("c://json.txt"); FileInputStream fis=new FileInputStream(file); byte[] b=new byte[2048]; fis.read(b); String jsonString =new String(b); jsonString =jsonString.trim(); System.out.println("json字符串:\n"+jsonString); jsonString=jsonString.replaceAll("\n|\r", ""); System.out.println("json字符串:\n"+jsonString); JSONObject jb = JSONObject.fromObject(jsonString); JSONArray ja = jb.getJSONArray("term_params"); String datetime=jb.getString("datetime"); System.out.println("datetime_____:"+datetime); for (int i = 0; i < ja.size(); i++) { String sn=ja.getJSONObject(i).getString("sn"); System.out.println("sn_____:"+sn); String keyParamJson=ja.getJSONObject(i).getString("key_params"); System.out.println("keyParamJson_______"+keyParamJson); //替换[ 和 ] keyParamJson=keyParamJson.replaceAll("(\\[)", ""); keyParamJson=keyParamJson.replaceAll("(\\])", ""); System.out.println("keyParamJson_______"+keyParamJson); JSONObject jbParams = JSONObject.fromObject(keyParamJson); String a=jbParams.getString("auk_data"); System.out.println("auk_data____:"+a); } } }
public class TestLen { /** * @param args * @throws IOException */ public static void main(String[] args) throws IOException { File file=new File("c://11.txt"); try { FileInputStream fis=new FileInputStream(file); byte[] b=new byte[4]; fis.read(b); byte[] c=new byte[4]; fis.read(c); //String len = new String(b,"ISO-8859-1"); String len = new String(b); System.out.println(len); String cstr = new String(c); System.out.println(cstr); int lenInt=Integer.valueOf(len); System.out.println(lenInt); } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }
public class TestNewLine { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub String a="111"; String b="\n"; String c=a+b; System.out.println(c.length()); System.out.println(c); } }
public class TestRandom { /** * @param args */ public static void main(String[] args) { Random r=new Random(); int a=r.nextInt(6000); System.out.println(a); } }
public class TestReturn { /** * @param args */ public static void main(String[] args) { String a = a(); System.out.println(a); } private static String a() { if (true) { if (true) { return "2"; } return "1"; } return null; } }
public class TestSplit { /** * @param args * @throws IOException */ public static void main(String[] args) throws IOException { File f = new File("C:\\11.txt"); BufferedReader bf = new BufferedReader(new FileReader(f)); String str; String sourceLen = bf.readLine(); System.out.println(sourceLen); int lengthAll = sourceLen.length(); int lengthLast = 0; String mac = null; while ((str = bf.readLine()) != null) { System.out.println("总长度" + lengthAll); System.out.println("本次长度" + str.trim().length()); System.out.println("上一个数据长度" + lengthLast); if (lengthLast == 0 || lengthLast == str.trim().length()) { lengthAll = lengthAll + str.length(); String[] s = str.split(","); System.out.println(s[1]); lengthLast = str.trim().length(); } else { mac = str; System.out.println("MAC:" + mac); } } } }
public class TestTime { /** * @param args */ public static void main(String[] args) { Date date = new Date(); System.out.println(date.getTime()-5555); System.out.println(new Date()); } }
public class TestVarArgus { /** * @param args */ public static void main(String[] args) { String a=null; String b="1"; String c="dsada"; verifyString(c,a,b); } private static void verifyString(String...msgs){ for(String s:msgs){ if(StringUtil.isEmpty(s)){ System.out.println("ok"); break; } System.out.println(s); } } }
public static void main(String[] args) { test(); } private static String test(){ try{ System.out.println("1111"); return test1(); }catch (Exception e) { // TODO: handle exception } finally{ System.out.println("22222"); } return null; } private static String test1(){ System.out.println("return out"); return null; }
