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mkyongmkyong
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‎java-string/pom.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
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http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>com.mkyong</groupId>
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<artifactId>string</artifactId>
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<version>1.0</version>
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<name>java-string</name>
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<url>https://mkyong.com</url>
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<properties>
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<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
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<maven.compiler.source>17</maven.compiler.source>
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<maven.compiler.target>17</maven.compiler.target>
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<java.version>17</java.version>
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<junit.version>5.4.0</junit.version>
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</properties>
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<dependencies>
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<dependency>
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<groupId>org.junit.jupiter</groupId>
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<artifactId>junit-jupiter-params</artifactId>
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<version>${junit.version}</version>
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<scope>test</scope>
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</dependency>
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</dependencies>
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<build>
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<finalName>java-basic</finalName>
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<plugins>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-compiler-plugin</artifactId>
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<version>3.8.1</version>
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<configuration>
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<source>${java.version}</source>
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<target>${java.version}</target>
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</configuration>
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</plugin>
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</plugins>
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</build>
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</project>

‎java-string/src/main/java/com/mkyong/string/ConvertBytesToString.java‎

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package com.mkyong.string;
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import java.nio.charset.StandardCharsets;
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public class ConvertBytesToString {
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public static void main(String[] args) {
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// String to byte[]
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byte[] bytes = "mkyong".getBytes(StandardCharsets.UTF_8);
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// byte[] to String
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String s = new String(bytes, StandardCharsets.UTF_8);
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// mkyong
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System.out.println(s);
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}
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}

‎java-string/src/main/java/com/mkyong/string/ConvertStringToBytes.java‎

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package com.mkyong.string;
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import java.nio.charset.Charset;
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import java.nio.charset.StandardCharsets;
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import java.util.Base64;
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public class ConvertStringToBytes {
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public static void main(String[] args) {
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String example = "This is an example";
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// default charset, a bit dangerous
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byte[] output1 = example.getBytes();
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// in old days, before java 1.7
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byte[] output2 = example.getBytes(Charset.forName("UTF-8"));
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// the best , java 1.7+
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byte[] output3 = example.getBytes(StandardCharsets.UTF_8);
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System.out.println("Text : " + example);
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// base64 encode
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String base64encoded = Base64.getEncoder().encodeToString(output3);
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System.out.println("Text [Base64] : " + base64encoded);
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}
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}

‎java-string/src/main/java/com/mkyong/string/StringTokenizerExample.java‎

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package com.mkyong.string;
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import java.io.BufferedReader;
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import java.io.FileNotFoundException;
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import java.io.FileReader;
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import java.io.IOException;
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import java.nio.file.Files;
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import java.nio.file.Path;
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import java.nio.file.Paths;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.StringTokenizer;
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public class StringTokenizerExample {
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public static void main(String[] args) throws IOException {
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StringTokenizer st = new StringTokenizer("1, 2, 3, 4, 5");
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while (st.hasMoreTokens()) {
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System.out.println(st.nextToken().trim());
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}
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/*String line = "This is a String, split by, StringTokenizer example.";
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List<String> result = split(line, ",");
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for (String s : result) {
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System.out.println(s.trim());
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}*/
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/*StringTokenizerExample obj = new StringTokenizerExample();
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List<Trend> trends = obj.readFile(Paths.get("C:\\test\\sample.csv"), "|");
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trends.forEach(System.out::println);*/
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}
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public static List<String> split(String line, String delimiter) {
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List<String> result = new ArrayList<>();
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StringTokenizer st = new StringTokenizer(line, delimiter);
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while (st.hasMoreTokens()) {
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result.add(st.nextToken());
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}
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return result;
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}
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public List<Trend> readFile(Path path, String delimiter) throws IOException {
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List<Trend> result = new ArrayList<>();
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try (BufferedReader br = new BufferedReader(new FileReader(path.toString()))) {
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String line;
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while ((line = br.readLine()) != null) {
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StringTokenizer st = new StringTokenizer(line, delimiter);
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while (st.hasMoreTokens()) {
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Integer id = Integer.parseInt(st.nextToken().trim());
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Double index = Double.parseDouble(st.nextToken().trim());
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String desc = st.nextToken().trim();
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result.add(new Trend(id, index, desc));
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}
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}
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}
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return result;
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}
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class Trend {
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private int id;
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private Double index;
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private String desc;
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public Trend(int id, Double index, String desc) {
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this.id = id;
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this.index = index;
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this.desc = desc;
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}
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@Override
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public String toString() {
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return "Trend{" +
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"id=" + id +
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", index=" + index +
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", desc='" + desc + '\'' +
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'}';
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}
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}
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}

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