- public class Test_Interface
- {
- public static void main(String[] args)
- {
-
- StringBuffer strb = new StringBuffer();
- strb.append(62).append("YES").append(true);
- System.out.println(strb);
-
- strb.insert(strb.length(), 'f');
- System.out.println(strb);
-
- strb.delete(8, 9);
- System.out.println(strb);
-
- strb.deleteCharAt(8);
- System.out.println(strb);
-
- strb.reverse();
- System.out.println(strb);
-
- String s-s-rb = strb.substring(2, 6);
- System.out.println(s-s-rb);
-
- strb.setCharAt(7, '9');
- System.out.println(strb);
-
- strb.replace(0, strb.length() - 1, "AS");
- System.out.println(strb);
-
- strb.capacity();
- System.out.println(strb.capacity());
-
- strb.setLength(2);
- System.out.println(strb);
-
-
-
- System.out.println(Math.abs(-56));
- System.out.println(Math.max(-23, -2));
- System.out.println(Math.min(-23, -2));
- System.out.println(Math.pow(10, -2));
- System.out.println(Math.sqrt(100));
- System.out.println(Math.round(2.6));
- System.out.println(Math.floor(-1.1));
- System.out.println(Math.random());
- System.out.println(Math.PI);
-
-
-
- Random r = new Random();
- System.out.println(r.nextInt(10000) % 35 + 1);
-
-
-
- Calendar ca = Calendar.getInstance();
- int month = ca.get(Calendar.MONTH);
- System.out.println(month);
- System.out.println(ca.toString());
-
- Date date = new Date();
- SimpleDateFormat sday = new SimpleDateFormat("yy-MM-dd HH:mm:ss");
- String sdate = sday.format(date);
- System.out.println(sdate);
-
-
- Collection<String> alist = new ArrayList<String>();
- alist.add("AAA");
- alist.add("BBB");
- alist.add("CCC");
- alist.add("DDD");
- alist.add("EEE");
-
- System.out.println(alist);
-
- for (String newlist : alist)
- {
- System.out.println(newlist);
- }
-
-
-
- Iterator<String> diedai = alist.iterator();
-
- while (diedai.hasNext())
- {
- String ss = diedai.next();
- System.out.println(ss);
- }
-
-
- HashSet<Stud> hset = new HashSet<Stud>();
-
- hset.add(new Stud("HH", 26));
- hset.add(new Stud("LL", 35));
- hset.add(new Stud("HH", 26));
-
- System.out.println(hset);
-
- Iterator<Stud> ite = hset.iterator();
- while (ite.hasNext())
- {
- Stud ss = ite.next();
- System.out.println(ss);
- }
-
-
- ArrayList<Integer> utils = new ArrayList<Integer>();
- utils.add(53);
- utils.add(5);
- utils.add(2);
- utils.add(37);
- utils.add(25);
-
- System.out.println(utils);
- System.out.println(utils.size());
-
- Collections.sort(utils);
- System.out.println(utils);
-
- int pos = Collections.binarySearch(utils,36);
- System.out.println(pos);
-
-
- int[] array = new int[]{1, 3, 7,5, 4,7, 6};
- int[] newArr = Arrays.copyOf(array, 6);
- int[] newArr3 = Arrays.copyOf(array, 3);
- int[] newArr2 = Arrays.copyOfRange(array, 2, 9);
- Arrays.sort(array);
-
- System.out.println(Arrays.toString(array));
- int pos = Arrays.binarySearch(array, 7);
- System.out.println(pos);
- }
- }
本文转自 glblong 51CTO博客,原文链接:http://blog.51cto.com/glblong/1186831,如需转载请自行联系原作者