New Examples

Author: lokeshgupta1981

src/main/java/com/howtodoinjava/algorithms/IsomorphicStrings.java

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+package com.howtodoinjava.algorithms;
+
+public class IsomorphicStrings {
+
+  public boolean areIsomorphic(String s1, String s2) {
+    if (s1 == null || s2 == null
+        || s1.length() != s2.length()) {
+      return false;
+    }
+
+    int[] arr1 = new int[256];
+    int[] arr2 = new int[256];
+
+    for (int i = 0; i < s1.length(); i++) {
+
+      char c1 = s1.charAt(i);
+      char c2 = s2.charAt(i);
+
+      if (arr1[c1] != arr2[c2]) {
+        return false;
+      }
+
+      arr1[c1] = i + 1;
+      arr2[c2] = i + 1;
+    }
+    return true;
+  }
+
+  public static void main(String[] args) {
+    IsomorphicStrings iso = new IsomorphicStrings();
+    System.out.println(iso.areIsomorphic("abbcdd", "qwwcrr")); // true
+    System.out.println(iso.areIsomorphic("aab", "que")); // false
+  }
+}

src/main/java/com/howtodoinjava/core/string/MultilineStringExample.java

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+package com.howtodoinjava.core.string;
+
+import java.util.StringJoiner;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+@SuppressWarnings("StringTemplateMigration")
+public class MultilineStringExample {
+
+  public static void main(String[] args) {
+
+    //Text Blocks
+    String content = """
+        Line 1
+        'Line 2'
+        "Line 3"
+        Line 4 
+        """;
+
+    System.out.println(content);
+
+    String json = """
+        {
+          "name": "John Doe",
+          "age": 30,
+          "city": "New York"
+        }
+        """;
+    System.out.println(json);
+
+    // String Concatenation
+
+    String NEW_LINE = System.getProperty("line.separator");
+
+    content = "Line 1" +
+        NEW_LINE +
+        "'Line 2'" +
+        NEW_LINE +
+        "\"Line 3\"" +
+        NEW_LINE +
+        "Line 4 ";
+
+    System.out.println(content);
+
+    StringBuffer sb = new StringBuffer();
+
+    content = sb.append("Line 1")
+        .append(NEW_LINE)
+        .append("'Line 2'")
+        .append(NEW_LINE)
+        .append("\"Line 3\"")
+        .append(NEW_LINE)
+        .append("Line 4 ").toString();
+
+    System.out.println(content);
+
+    //String Join
+    content = String.join(NEW_LINE,
+        "Line 1",
+        "'Line 2'",
+        "\"Line 3\"",
+        "Line 4 ");
+
+    System.out.println(content);
+
+    //StringJoiner
+
+    StringJoiner stringJoiner = new StringJoiner(NEW_LINE);
+
+    content = stringJoiner.add("Line 1")
+        .add("'Line 2'")
+        .add("\"Line 3\"")
+        .add("Line 4 ").toString();
+
+    System.out.println(content);
+
+    //Stream API
+
+    content = Stream.of("Line 1", "'Line 2'", "\"Line 3\"", "Line 4 ")
+        .collect(Collectors.joining(NEW_LINE));
+
+    System.out.println(content);
+  }
+}

src/main/java/com/howtodoinjava/core/string/StringIndentExample.java

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+package com.howtodoinjava.core.string;
+
+public class StringIndentExample {
+
+  public static void main(String[] args) {
+    String line1 = "ABC".indent(8);
+    System.out.println(line1.replace(" ", "-"));
+
+    String line2 = "ABC".indent(8).indent(-5);
+    System.out.println(line2.replace(" ", "-"));
+
+    String textBlock = """
+        Line 1
+        Line 2""";
+
+    String indentedBlock = """
+        Line 1
+        Line 2""".indent(8);
+
+    System.out.println(textBlock.replace(" ", "-"));
+    System.out.println(indentedBlock.replace(" ", "-"));
+  }
+
+}

src/main/java/com/howtodoinjava/core/string/TextBlockFormatting.java

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+package com.howtodoinjava.core.string;
+
+import java.text.MessageFormat;
+
+public class TextBlockFormatting {
+
+  public static void main(String[] args) {
+
+    //Expected Output
+    /*{
+      "id": 1001,
+        "name": "John Doe",
+        "age": 34
+    }*/
+
+    int id = 1001;
+    int age = 34;
+    String name = "John Doe";
+
+    Object[] formatArguments = {
+        1001,     // id
+        "John Doe",  // name
+        34       // age
+    };
+
+
+    /*String greeting = """
+                  Hello, """ + name + """
+                  Welcome to Java text blocks!
+                  """;
+
+    System.out.println(greeting.toString());  //Prints "Hello,John DoeWelcome to Java text blocks!"*/
+
+
+
+    String textBlock = """
+        {
+          "id": %d,
+          "name": "%s",
+          "age": %d
+        }
+        """;
+
+    String formattedTextBlock1 = String.format(textBlock, formatArguments);
+    System.out.println(formattedTextBlock1);
+
+    String formattedTextBlock2 = String.format(textBlock, id, name, age);
+    System.out.println(formattedTextBlock2);
+
+
+    String json = """
+        '{'
+           "id": {0, number, #},
+           "name": "{1}",
+           "salary": "{2, number, integer}"
+        '}'
+        """;
+
+    Object[] arguments = {
+        1001,     // id
+        "John Doe",  // name
+        34000       // salary
+    };
+
+    String formattedTextBlock3 = MessageFormat.format(json, arguments);
+    System.out.println(formattedTextBlock3);
+  }
+}