‘table.columnsOfType’ method returns all the columns of specific type.
Example
table.columnsOfType(ColumnType.STRING).forEach(column -> System.out.println(column.print()));
Above statement print all the columns of type string.
package com.sample.app;
import java.time.LocalDate;
import java.util.Arrays;
import java.util.List;
import tech.tablesaw.api.ColumnType;
import tech.tablesaw.api.DateColumn;
import tech.tablesaw.api.IntColumn;
import tech.tablesaw.api.StringColumn;
import tech.tablesaw.api.Table;
public class App {
public static void main(String args[]) {
int[] empIds = { 1, 2, 3, 4 };
String[] firstNames = { "Hari", "Ram", "Sowmya", "Chamu" };
String[] lastNames = { "Krishna", "Gurram", "Maj", "Dev" };
List<LocalDate> dateOfBirths = Arrays.asList(LocalDate.of(1988, 5, 1), LocalDate.of(1976, 8, 1),
LocalDate.of(1948, 5, 11), LocalDate.of(1968, 5, 21));
Table table = Table.create().addColumns(IntColumn.create("Employee Ids", empIds))
.addColumns(StringColumn.create("FirstName", firstNames))
.addColumns(StringColumn.create("LastName", lastNames))
.addColumns(DateColumn.create("Date Of Birth", dateOfBirths));
System.out.println(table.print() + "\n");
table.columnsOfType(ColumnType.STRING).forEach(column -> System.out.println(column.print()));
}
}
Output
Employee Ids | FirstName | LastName | Date Of Birth |
-------------------------------------------------------------
1 | Hari | Krishna | 1988-05-01 |
2 | Ram | Gurram | 1976-08-01 |
3 | Sowmya | Maj | 1948-05-11 |
4 | Chamu | Dev | 1968-05-21 |
Column: FirstName
Hari
Ram
Sowmya
Chamu
Column: LastName
Krishna
Gurram
Maj
Dev
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