Java tutorial
/** * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance * with the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package org.trend.hgraph; import static org.junit.Assert.assertArrayEquals; import static org.junit.Assert.assertEquals; import java.math.BigDecimal; import java.math.RoundingMode; import java.util.UUID; import java.util.regex.Matcher; import java.util.regex.Pattern; import org.apache.commons.lang.time.StopWatch; import org.junit.After; import org.junit.AfterClass; import org.junit.Assert; import org.junit.Before; import org.junit.BeforeClass; import org.junit.Ignore; import org.junit.Test; import cern.colt.Arrays; public class VariousTest { @BeforeClass public static void setUpBeforeClass() throws Exception { } @AfterClass public static void tearDownAfterClass() throws Exception { } @Before public void setUp() throws Exception { } @After public void tearDown() throws Exception { } @Test public void testClassName() { System.out.println(String.class.getSimpleName()); System.out.println(Integer.class.getSimpleName()); System.out.println(Long.class.getSimpleName()); System.out.println(BigDecimal.class.getSimpleName()); } @Test public void testSubString() { String delimiter = "@"; String prefix = "abcd"; String suffix = "efgh"; String value = prefix + delimiter + suffix; assertEquals(prefix, value.substring(0, value.indexOf(delimiter))); assertEquals(suffix, value.substring(value.indexOf(delimiter) + 1, value.length())); delimiter = "@@"; value = prefix + delimiter + suffix; assertEquals(prefix, value.substring(0, value.indexOf(delimiter))); assertEquals(suffix, value.substring(value.indexOf(delimiter) + delimiter.length(), value.length())); } @Test public void testUuid() { UUID uuid = UUID.randomUUID(); System.out.println("UUID=" + uuid); System.out.println("UUID.toString()=" + uuid.toString()); } @Test @Ignore //for test StopWatch behavior public void testStopWatch() throws InterruptedException { StopWatch timer = new StopWatch(); // #1 timer.start(); Thread.sleep(5000); timer.stop(); System.out.println("timer.toString=" + timer.toString()); // System.out.println("timer.toSplitString=" + timer.toSplitString()); // #2 timer.reset(); timer.start(); Thread.sleep(4000); timer.split(); System.out.println("timer.toSplitString=" + timer.toSplitString()); Thread.sleep(5000); timer.split(); System.out.println("timer.toSplitString=" + timer.toSplitString()); timer.unsplit(); Thread.sleep(6000); timer.stop(); System.out.println("timer.toString=" + timer.toString()); } @Test public void testBigDecimal() { int a = 10000; float b = 0.2F; BigDecimal ba = null; BigDecimal bb = null; ba = new BigDecimal(a); bb = new BigDecimal(b); System.out.println(ba.multiply(bb).intValue()); } @Test public void testBooleanArrayInitial() { boolean[] test = new boolean[5]; System.out.println(Arrays.toString(test)); } @Test public void testStringSplit() { String str1 = "1,2,3"; assertArrayEquals(new String[] { "1", "2", "3" }, str1.split(",")); String str2 = "1"; assertArrayEquals(new String[] { "1" }, str2.split(",")); } @Test public void testCopyArray() { String[] src = { "a", "b", "c" }; String[] dest = new String[2]; System.arraycopy(src, 1, dest, 0, 2); assertArrayEquals(new String[] { "b", "c" }, dest); } @Test public void testBigDecimalCompare() { BigDecimal a = null; BigDecimal b = null; System.out.println("***test scale"); a = new BigDecimal("2.12345"); System.out.println(a.scale()); a = new BigDecimal("200.12345"); System.out.println(a.scale()); a = new BigDecimal("200.12"); System.out.println(a.scale()); a = new BigDecimal("200.12345"); System.out.println(a); a = a.setScale(2, RoundingMode.DOWN); System.out.println(a); System.out.println(a.scale()); System.out.println("***test compare #1"); a = new BigDecimal("500.123456"); b = new BigDecimal("500.126543"); System.out.println("a=" + a); System.out.println("b=" + b); System.out.println("a comapre b =>" + a.compareTo(b)); a = a.setScale(2, RoundingMode.DOWN); b = b.setScale(2, RoundingMode.DOWN); System.out.println("a=" + a); System.out.println("b=" + b); System.out.println("a comapre b =>" + a.compareTo(b)); System.out.println("***test compare #2"); a = new BigDecimal("500.1"); b = new BigDecimal("500.126543"); System.out.println("a=" + a); System.out.println("b=" + b); System.out.println("a comapre b =>" + a.compareTo(b)); a = a.setScale(3, RoundingMode.DOWN); b = b.setScale(3, RoundingMode.DOWN); System.out.println("a=" + a); System.out.println("b=" + b); System.out.println("a comapre b =>" + a.compareTo(b)); } @Test public void testRegExPattern() { String str = null; String regex = null; Pattern p = null; Matcher m = null; str = "191.254.169.46||IPc986b1a0b0d88d5fb2629f||URL-2-2-3-y-h-r-t-7-.v32c-to-5-8w-0yc-tzl8-h2a-7f-ezc-oxt1-7-8y-0elh-be-3k-d.info||DOMAIN"; regex = "^.+\\|\\|.+\\|\\|.*"; p = Pattern.compile(regex); m = p.matcher(str); Assert.assertTrue(m.matches()); } }