Question

我从这组代码中获得了不需要的额外列。我只想为不匹配的数据添加0，但它为我提供了所有数据列并分别指示0和1。

for ( int i = 0 ; i < GST.size(); i++)
    {           
        for ( String FLD: GHA.keySet() )
        {
            if ( GHA.get(FLD).containsKey(  GST.get(i)  ) )
                GHAS.get(FLD).append("1,");
            else //these 2 lines
                GHAS.get(FLD).append("0,"); //these 2 lines
        }
    }

    String resultString =  stringWriter.toString();

    for ( String FLD: GHA.keySet() )
        resultString += FLD+ "," +GHAS.get(FLD).toString() + System.getProperty("line.separator");

以下是此代码的输出

row1, 0, 0, 0, 1, 0
row2, 0, 0, 0, 0, 0
row3, 0, 0, 0, 0, 1
row4, 0, 0, 1, 0, 0
row5, 0, 0, 0, 0, 0

如果没有我已经指出过的2行

row1, 1,
row2, 
row3, 1,
row4, 1,
row5,

我想要的输出是

row1, 1,
row2, 0,
row3, 1,
row4, 1,
row5, 0,

Answer 1

for ( String FLD: GHA.keySet() )
    {
        boolean appended = false;           
        for ( int i = 0 ; i < GST.size(); i++)
        {
            if ( GHA.get(FLD).containsKey(  GST.get(i)  ) ) {
                GHAS.get(FLD).append("1,");
                appended = true;
                // optionally break here if you don't want multiple 1s
            }

        }
        if (!appended) {
            GHAS.get(FLD).append("0,"); // instead of those 2 lines
        }
    }

    String resultString =  stringWriter.toString();

    for ( String FLD: GHA.keySet() )
        resultString += FLD+ "," +GHAS.get(FLD).toString() + System.getProperty("line.separator");

对于包含不需要的多余列的循环

1 个答案: