I'm trying to print an ASCII table with each number and its corresponding value, but I don't know how to get the character associated with the number.
public static void main(String[] args) {
for(char letter= ' ';letter<274;letter++)
System.out.print(letter);
}
How can I print the associated character with the number?
Here is a quick implementation you can copy & paste:
import java.util.ArrayList;
import java.util.List;
public class AsciiTable {
private final List<Column> columns = new ArrayList<>();
private final List<Row> data = new ArrayList<>();
private int maxColumnWidth = Integer.MAX_VALUE;
public void calculateColumnWidth() {
for (Column column : columns) {
column.width = column.name.length() + 1;
}
for (Row row : data) {
int colIdx = 0;
for (String value : row.values) {
Column column = columns.get(colIdx);
if (value == null) continue;
column.width = Math.max(column.width, value.length() + 1);
colIdx++;
}
}
for (Column column : columns) {
column.width = Math.min(column.width, maxColumnWidth);
}
}
public void render() {
StringBuilder sb = new StringBuilder();
writeSeparator(columns, sb);
writeColumnNames(columns, sb);
writeSeparator(columns, sb);
// values
writeValues(columns, data, sb);
writeSeparator(columns, sb);
System.out.println(sb.toString());
}
private void writeColumnNames(final List<Column> columns, final StringBuilder sb) {
sb.append("|");
for (Column column : columns) {
sb.append(String.format(" %-" + (column.width) + "s", column.name));
sb.append("|");
}
sb.append("\n");
}
private void writeSeparator(final List<Column> columns, final StringBuilder sb) {
sb.append("+");
for (Column column : columns) {
sb.append(String.format("%-" + (column.width + 1) + "s", "").replace(' ', '-'));
sb.append("+");
}
sb.append("\n");
}
private void writeValues(final List<Column> columns, final List<Row> rows, final StringBuilder sb) {
for (Row row : rows) {
int columnIdx = 0;
sb.append("|");
for (String value : row.values) {
if (value != null && value.length() > maxColumnWidth)
value = value.substring(0, maxColumnWidth - 1);
sb.append(String.format(" %-" + columns.get(columnIdx).width + "s", value));
sb.append("|");
columnIdx++;
}
sb.append("\n");
}
}
public List<Column> getColumns() {
return columns;
}
public List<Row> getData() {
return data;
}
public int getMaxColumnWidth() {
return maxColumnWidth;
}
public void setMaxColumnWidth(final int maxColumnWidth) {
this.maxColumnWidth = maxColumnWidth;
}
public static class Column {
private String name;
private int width;
public Column(final String name) {
this.name = name;
}
@Override
public String toString() {
return "Column{" +
"name='" + name + '\'' +
", width=" + width +
'}';
}
}
public static class Row {
private final List<String> values = new ArrayList<>();
public List<String> getValues() {
return values;
}
@Override
public String toString() {
return "Row{" +
"values=" + values +
'}';
}
}
}
Sample usage for a single column table:
AsciiTable table = new AsciiTable();
table.setMaxColumnWidth(45);
table.getColumns().add(new AsciiTable.Column("my column"));
for (String value : myListOfValues) {
AsciiTable.Row row = new AsciiTable.Row();
table.getData().add(row);
row.getValues().add(value);
}
table.calculateColumnWidth();
table.render();
Output:
+-----------+
| my column |
+-----------+
| one |
| two |
| three |
+-----------+
It's simple ...
for (int c=32; c<128; c++) {
System.out.println(c + ": " + (char)c);
}
c=32.Have a look at java.util.Formatter:
for(char letter= ' ';letter<274;letter++) {
System.out.printf("%d = %c\n", (int)letter, letter);
}
if (letter < 127 || letter > 159) { System.out.print(...) }. The characters in the range 127-159 are control characters, not printable characters, and they may not display anything useful and could have some interesting effects. Many Windows systems assign some printable text to those positions, though, so it may work. Don't count on it.