How to use

lineSeparator

method

in

java.lang.System

 try(BufferedReader br = new BufferedReader(new FileReader("file.txt"))) {
  StringBuilder sb = new StringBuilder();
  String line = br.readLine();

  while (line != null) {
    sb.append(line);
    sb.append(System.lineSeparator());
    line = br.readLine();
  }
  String everything = sb.toString();
}

 BufferedReader br = new BufferedReader(new FileReader("file.txt"));
try {
  StringBuilder sb = new StringBuilder();
  String line = br.readLine();

  while (line != null) {
    sb.append(line);
    sb.append(System.lineSeparator());
    line = br.readLine();
  }
  String everything = sb.toString();
} finally {
  br.close();
}

 public static String fileToString(InputStream inputStream) {
  BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
  return bufferedReader.lines().collect(Collectors.joining(System.lineSeparator()));
 }
}

  private String bodyToString(InputStream body) throws IOException {
    StringBuilder builder = new StringBuilder();
    BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(body, StandardCharsets.UTF_8));
    String line = bufferedReader.readLine();
    while (line != null) {
      builder.append(line).append(System.lineSeparator());
      line = bufferedReader.readLine();
    }
    bufferedReader.close();
    return builder.toString();
  }
}

  private String filterEmptyLine(String content) {
    final StringBuilder sb = new StringBuilder();
    try (Scanner scanner = new Scanner(content)) {
      while (scanner.hasNextLine()) {
        String line = scanner.nextLine();
        if (line != null) {
          // remove extra space at line's end
          line = StringUtils.stripEnd(line, " ");
          if (line.isEmpty()) {
            line = " ";
          }
        }
        sb.append(line).append(System.lineSeparator());
      }
    }

    return sb.toString();
  }
}

  private String filterEmptyLine(String content) {
    final StringBuilder sb = new StringBuilder();
    try (Scanner scanner = new Scanner(content)) {
      while (scanner.hasNextLine()) {
        String line = scanner.nextLine();
        if (line != null) {
          // remove extra space at line's end
          line = StringUtils.stripEnd(line, " ");
          if (line.isEmpty()) {
            line = " ";
          }
        }
        sb.append(line).append(System.lineSeparator());
      }
    }

    return sb.toString();
  }
}

  static FlinkException createAndLogException(PyException pe, Logger log) {
    StringWriter sw = new StringWriter();
    try (PrintWriter pw = new PrintWriter(sw)) {
      pe.printStackTrace(pw);
    }
    String pythonStackTrace = sw.toString().trim();

    log.error("Python function failed: " + System.lineSeparator() + pythonStackTrace);
    return new FlinkException("Python function failed: " + pythonStackTrace);
  }
}

/**
 * <p>Constructor.</p>
 *
 * <p>Use the static constant rather than instantiating.</p>
 */
MultiLineToStringStyle() {
  super();
  this.setContentStart("[");
  this.setFieldSeparator(System.lineSeparator() + "  ");
  this.setFieldSeparatorAtStart(true);
  this.setContentEnd(System.lineSeparator() + "]");
}

/**
 * Resets the fields responsible for the line breaks and indenting.
 * Must be invoked after changing the {@link #spaces} value.
 */
private void resetIndent() {
  setArrayStart("{" + System.lineSeparator() + spacer(spaces));
  setArraySeparator("," + System.lineSeparator() + spacer(spaces));
  setArrayEnd(System.lineSeparator() + spacer(spaces - INDENT) + "}");
  setContentStart("[" + System.lineSeparator() + spacer(spaces));
  setFieldSeparator("," + System.lineSeparator() + spacer(spaces));
  setContentEnd(System.lineSeparator() + spacer(spaces - INDENT) + "]");
}

@Test
public void testLong() {
  assertEquals(baseStr + "[" + System.lineSeparator() + "  3" + System.lineSeparator() + "]", new ToStringBuilder(base).append(3L).toString());
  assertEquals(baseStr + "[" + System.lineSeparator() + "  a=3" + System.lineSeparator() + "]", new ToStringBuilder(base).append("a", 3L).toString());
  assertEquals(baseStr + "[" + System.lineSeparator() + "  a=3" + System.lineSeparator() + "  b=4" + System.lineSeparator() + "]", new ToStringBuilder(base).append("a", 3L).append("b", 4L).toString());
}

@Test
public void testAppendSuper() {
  assertEquals(baseStr + "[" + System.lineSeparator() + "]", new ToStringBuilder(base).appendSuper("Integer@8888[" + System.lineSeparator() + "]").toString());
  assertEquals(baseStr + "[" + System.lineSeparator() + "  <null>" + System.lineSeparator() + "]", new ToStringBuilder(base).appendSuper("Integer@8888[" + System.lineSeparator() + "  <null>" + System.lineSeparator() + "]").toString());
  assertEquals(baseStr + "[" + System.lineSeparator() + "  a=hello" + System.lineSeparator() + "]", new ToStringBuilder(base).appendSuper("Integer@8888[" + System.lineSeparator() + "]").append("a", "hello").toString());
  assertEquals(baseStr + "[" + System.lineSeparator() + "  <null>" + System.lineSeparator() + "  a=hello" + System.lineSeparator() + "]", new ToStringBuilder(base).appendSuper("Integer@8888[" + System.lineSeparator() + "  <null>" + System.lineSeparator() + "]").append("a", "hello").toString());
  assertEquals(baseStr + "[" + System.lineSeparator() + "  a=hello" + System.lineSeparator() + "]", new ToStringBuilder(base).appendSuper(null).append("a", "hello").toString());
}

@Test
public void testLongArrayArray() {
  long[][] array = new long[][] {{1, 2}, null, {5}};
  assertEquals(baseStr + "[" + System.lineSeparator() + "  {{1,2},<null>,{5}}" + System.lineSeparator() + "]", new ToStringBuilder(base).append(array).toString());
  assertEquals(baseStr + "[" + System.lineSeparator() + "  {{1,2},<null>,{5}}" + System.lineSeparator() + "]", new ToStringBuilder(base).append((Object) array).toString());
  array = null;
  assertEquals(baseStr + "[" + System.lineSeparator() + "  <null>" + System.lineSeparator() + "]", new ToStringBuilder(base).append(array).toString());
  assertEquals(baseStr + "[" + System.lineSeparator() + "  <null>" + System.lineSeparator() + "]", new ToStringBuilder(base).append((Object) array).toString());
}

@Test
public void testLongArray() {
  long[] array = new long[] {1, 2, -3, 4};
  assertEquals(baseStr + "[" + System.lineSeparator() + "  {1,2,-3,4}" + System.lineSeparator() + "]", new ToStringBuilder(base).append(array).toString());
  assertEquals(baseStr + "[" + System.lineSeparator() + "  {1,2,-3,4}" + System.lineSeparator() + "]", new ToStringBuilder(base).append((Object) array).toString());
  array = null;
  assertEquals(baseStr + "[" + System.lineSeparator() + "  <null>" + System.lineSeparator() + "]", new ToStringBuilder(base).append(array).toString());
  assertEquals(baseStr + "[" + System.lineSeparator() + "  <null>" + System.lineSeparator() + "]", new ToStringBuilder(base).append((Object) array).toString());
}

@Test
public void testObjectArray() {
  Object[] array = new Object[] {null, base, new int[] {3, 6}};
  assertEquals(baseStr + "[" + System.lineSeparator() + "  {<null>,5,{3,6}}" + System.lineSeparator() + "]", new ToStringBuilder(base).append(array).toString());
  assertEquals(baseStr + "[" + System.lineSeparator() + "  {<null>,5,{3,6}}" + System.lineSeparator() + "]", new ToStringBuilder(base).append((Object) array).toString());
  array = null;
  assertEquals(baseStr + "[" + System.lineSeparator() + "  <null>" + System.lineSeparator() + "]", new ToStringBuilder(base).append(array).toString());
  assertEquals(baseStr + "[" + System.lineSeparator() + "  <null>" + System.lineSeparator() + "]", new ToStringBuilder(base).append((Object) array).toString());
}

@Test
public void testPerson() {
  final Person p = new Person();
  p.name = "Jane Doe";
  p.age = 25;
  p.smoker = true;
  final String pBaseStr = p.getClass().getName() + "@" + Integer.toHexString(System.identityHashCode(p));
  assertEquals(pBaseStr + "[" + System.lineSeparator() + "  name=Jane Doe" + System.lineSeparator() + "  age=25" + System.lineSeparator() + "  smoker=true" + System.lineSeparator() + "]", new ToStringBuilder(p).append("name", p.name).append("age", p.age).append("smoker", p.smoker).toString());
}

@Test
public void testBlank() {
  assertEquals(baseStr + "[" + System.lineSeparator() + "]", new ToStringBuilder(base).toString());
}

public String listProvider() {
  StringBuilder stringBuilder = new StringBuilder();
  stringBuilder.append("As Provider side:" + System.lineSeparator());
  Collection<ProviderModel> ProviderModelList = ApplicationModel.allProviderModels();
  TTable tTable = new TTable(new TTable.ColumnDefine[]{
      new TTable.ColumnDefine(TTable.Align.MIDDLE),
      new TTable.ColumnDefine(TTable.Align.MIDDLE)
  });
  //Header
  tTable.addRow("Provider Service Name", "PUB");
  //Content
  for (ProviderModel providerModel : ProviderModelList) {
    tTable.addRow(providerModel.getServiceName(), isRegistered(providerModel.getServiceName()) ? "Y" : "N");
  }
  stringBuilder.append(tTable.rendering());
  return stringBuilder.toString();
}

public String listProvider() {
  StringBuilder stringBuilder = new StringBuilder();
  stringBuilder.append("As Provider side:" + System.lineSeparator());
  Collection<ProviderModel> ProviderModelList = ApplicationModel.allProviderModels();
  TTable tTable = new TTable(new TTable.ColumnDefine[]{
      new TTable.ColumnDefine(TTable.Align.MIDDLE),
      new TTable.ColumnDefine(TTable.Align.MIDDLE)
  });
  //Header
  tTable.addRow("Provider Service Name", "PUB");
  //Content
  for (ProviderModel providerModel : ProviderModelList) {
    tTable.addRow(providerModel.getServiceName(), isRegistered(providerModel.getServiceName()) ? "Y" : "N");
  }
  stringBuilder.append(tTable.rendering());
  return stringBuilder.toString();
}

  public String listConsumer() {
    StringBuilder stringBuilder = new StringBuilder();
    stringBuilder.append("As Consumer side:" + System.lineSeparator());
    Collection<ConsumerModel> consumerModelList = ApplicationModel.allConsumerModels();

    TTable tTable = new TTable(new TTable.ColumnDefine[]{
        new TTable.ColumnDefine(TTable.Align.MIDDLE),
        new TTable.ColumnDefine(TTable.Align.MIDDLE)
    });

    //Header
    tTable.addRow("Consumer Service Name", "NUM");

    //Content
    //TODO to calculate consumerAddressNum
    for (ConsumerModel consumerModel : consumerModelList) {
      tTable.addRow(consumerModel.getServiceName(), getConsumerAddressNum(consumerModel.getServiceName()));
    }

    stringBuilder.append(tTable.rendering());

    return stringBuilder.toString();
  }
}

  public String listConsumer() {
    StringBuilder stringBuilder = new StringBuilder();
    stringBuilder.append("As Consumer side:" + System.lineSeparator());
    Collection<ConsumerModel> consumerModelList = ApplicationModel.allConsumerModels();

    TTable tTable = new TTable(new TTable.ColumnDefine[]{
        new TTable.ColumnDefine(TTable.Align.MIDDLE),
        new TTable.ColumnDefine(TTable.Align.MIDDLE)
    });

    //Header
    tTable.addRow("Consumer Service Name", "NUM");

    //Content
    //TODO to calculate consumerAddressNum
    for (ConsumerModel consumerModel : consumerModelList) {
      tTable.addRow(consumerModel.getServiceName(), getConsumerAddressNum(consumerModel.getServiceName()));
    }

    stringBuilder.append(tTable.rendering());

    return stringBuilder.toString();
  }
}