Java lib在控制台上构建和打印表？ [英] Java lib to build and print table on console?

问题描述

是否有Java lib允许您以编程方式构建表，例如通过一个接一个地添加行/列，最后返回一个字符串（...可以在控制台上打印出来等等）？

Is there a Java lib out there which allows you to programatically build a table, e.g. by adding rows/cols one after each other, and finally returns a string (...that can be printed out on console or so)?

我找到的库并且只知道地址UI组件（JTable，Swing，AWT）...

The libs I have found and know address UI components (JTable, Swing, AWT) only...

推荐答案

我正在寻找类似的东西并结束我自己写的，我很乐意与你分享。我想要一些我可以使用的东西，比如

I was looking for something like this and ended up writing it myself, which I am happy to share with you. I wanted something that I can use like

ConsoleStringTable table= new ConsoleStringTable();
table.addString(0, 0, "AveryVeryVeryLongWord");
table.addString(0, 1, "AnotherWord");
table.addString(1, 0, "Short");
table.addString(1, 1, "Fast");
System.out.println(table.toString());

哪些输出

AveryVeryVeryLongWord AnotherWord
Short                 Fast       

实施

使用guava进行填充​​

using guava for padding

package util;

import java.util.HashMap;
import java.util.Map;

import com.google.common.base.Strings;

public class ConsoleStringTable {

    private class Index {

        int _row, _colum;

        public Index (int r, int c) {
            _row= r;
            _colum= c;
        }

        @Override
        public boolean equals (Object obj) {
            if (this == obj)
                return true;
            if (obj == null)
                return false;
            if (getClass() != obj.getClass())
                return false;
            Index other= (Index) obj;
            if (_colum != other._colum)
                return false;
            if (_row != other._row)
                return false;
            return true;
        }

        @Override
        public int hashCode () {
            final int prime= 31;
            int result= 1;
            result= prime * result + _colum;
            result= prime * result + _row;
            return result;
        }
    }

    Map<Index, String> _strings= new HashMap<ConsoleStringTable.Index, String>();
    Map<Integer, Integer> _columSizes= new HashMap<Integer, Integer>();

    int _numRows= 0;
    int _numColumns= 0;

    public void addString (int row, int colum, String content) {
        _numRows= Math.max(_numRows, row + 1);
        _numColumns= Math.max(_numColumns, colum + 1);

        Index index= new Index(row, colum);
        _strings.put(index, content);

        setMaxColumnSize(colum, content);
    }

    private void setMaxColumnSize (int colum, String content) {
        int size= content.length();
        Integer currentSize= _columSizes.get(colum);
        if (currentSize == null || (currentSize != null && currentSize < size)) {
            _columSizes.put(colum, size);
        }
    }

    public int getColumSize (int colum) {
        Integer size= _columSizes.get(colum);
        if (size == null) {
            return 0;
        } else {
            return size;
        }
    }

    public String getString (int row, int colum) {
        Index index= new Index(row, colum);
        String string= _strings.get(index);
        if (string == null) {
            return "";
        } else {
            return string;
        }
    }

    public String getTableAsString (int padding) {
        String out= "";
        for (int r= 0; r < _numRows; r++) {
            for (int c= 0; c < _numColumns; c++) {
                int columSize= getColumSize(c);
                String content= getString(r, c);
                int pad= c == _numColumns - 1 ? 0 : padding;
                out+= Strings.padEnd(content, columSize + pad, ' ');
            }
            if (r < _numRows - 1) {
                out+= "\n";
            }
        }
        return out;
    }

    @Override
    public String toString () {
        return getTableAsString(1);
    }

}

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