src/UserGuide/develop/QuickStart/QuickStart-JAVA.md

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# Quick Start - Java

## Dependencies

- JDK >=1.8
- Maven >=3.6

## Installation Method

Using TsFile API with Maven:

```shell
<dependency>
    <groupId>org.apache.tsfile</groupId>
    <artifactId>tsfile</artifactId>
    <version>2.3.1</version>
</dependency>
```

## Writing Process

### Construct ITsFileWriter

```shell
String path = "test.tsfile";
File f = FSFactoryProducer.getFSFactory().getFile(path);

String tableName = "table1";

TableSchema tableSchema =
        new TableSchema(
                tableName,
                Arrays.asList(
                        new ColumnSchemaBuilder()
                                .name("id1")
                                .dataType(TSDataType.STRING)
                                .category(Tablet.ColumnCategory.TAG)
                                .build(),
                        new ColumnSchemaBuilder()
                                .name("id2")
                                .dataType(TSDataType.STRING)
                                .category(Tablet.ColumnCategory.TAG)
                                .build(),
                        new ColumnSchemaBuilder()
                                .name("s1")
                                .dataType(TSDataType.INT32)
                                .category(Tablet.ColumnCategory.FIELD)
                                .build(),
                        new ColumnSchemaBuilder()
                                .name("s2").
                                dataType(TSDataType.BOOLEAN)
                                .build()));

long memoryThreshold = 10 * 1024 * 1024;

ITsFileWriter writer =
             new TsFileWriterBuilder()
                     .file(f)
                     .tableSchema(tableSchema)
                     .memoryThreshold(memoryThreshold)
                     .build();
```

### Write Data

```shell
Tablet tablet =
        new Tablet(
                Arrays.asList("id1", "id2", "s1", "s2"),
                Arrays.asList(
                        TSDataType.STRING, TSDataType.STRING, TSDataType.INT32, TSDataType.BOOLEAN));

for (int row = 0; row < 5; row++) {
    long timestamp = row;
    tablet.addTimestamp(row, timestamp);
    tablet.addValue(row, "id1", "id1_filed_1");
    tablet.addValue(row, "id2", "id2_filed_1");
    tablet.addValue(row, "s1", row);
    tablet.addValue(row, "s2", true);
}

writer.write(tablet);
```

### Close File

```shell
writer.close();
```

### Sample Code

The sample code of using these interfaces is in <https://github.com/apache/tsfile/blob/develop/java/examples/src/main/java/org/apache/tsfile/v4/WriteTabletWithITsFileWriter.java>

## Query Process

### Construct ITsFileReader

```shell
String path = "test.tsfile";
File f = FSFactoryProducer.getFSFactory().getFile(path);

ITsFileReader reader = 
             new TsFileReaderBuilder()
                     .file(f)
                     .build();
```

### Construct Query Request

```shell
TableSchema schema = reader.getTableSchemas(tableName);
TagFilterBuilder filterBuilder = new TagFilterBuilder(schema);
ResultSet resultSet = reader.query(tableName, Arrays.asList("id1", "id2", "s1", "s2"), 
    2, 8, filterBuilder.eq("id1", "id1_filed_1"));
```

### Query Data

```shell
ResultSetMetadata metadata = resultSet.getMetadata();
System.out.println(metadata);

StringJoiner sj = new StringJoiner(" ");
for (int column = 1; column <= 5; column++) {
    sj.add(metadata.getColumnName(column) + "(" + metadata.getColumnType(column) + ") ");
}
System.out.println(sj.toString());

while (resultSet.next()) {
    Long timeField = resultSet.getLong("Time");
    String id1Field = resultSet.isNull("id1") ? null : resultSet.getString("id1");
    String id2Field = resultSet.isNull("id2") ? null : resultSet.getString("id2");
    Integer s1Field = resultSet.isNull("s1") ? null : resultSet.getInt(4);
    Boolean s2Field = resultSet.isNull("s2") ? null : resultSet.getBoolean(5);
    sj = new StringJoiner(" ");
    System.out.println(
            sj.add(timeField + "")
                    .add(id1Field)
                    .add(id2Field)
                    .add(s1Field + "")
                    .add(s2Field + "")
                    .toString());
}
```

### Close File

```shell
reader.close();
```

### Sample Code

The sample code of using these interfaces is in <https://github.com/apache/tsfile/blob/develop/java/examples/src/main/java/org/apache/tsfile/v4/ITsFileReaderAndITsFileWriter.java>

> Note: The above read/write examples are all based on the table model interface. For details about the interface definition, please refer to [Java Interface Definition](./InterfaceDefinition/InterfaceDefinition-Java.md). If you need information regarding the tree model, please contact us.