在Google Guava中打印HashBasedTable的所有键和值 [英] Print all keys and value for HashBasedTable in Google Guava

问题描述

我创建并填充番石榴表 使用以下代码：

I create and populate a Guava Table using the following code:

Table<String, String, Integer> table = HashBasedTable.create();
table.put("A", "B", 1);
table.put("A", "C", 2);
table.put("B", "D", 3);

我想知道如何迭代表并打印每行的键和值？所以，期望的输出是：

I wonder how to iterate over table and print out both keys and value for each row? So, the desired output is:

A B 1
A C 2
B D 3

推荐答案

我不是番石榴用户所以这可能是矫枉过正（如果是真的那么将会很高兴任何信息）但您可以使用 table.rowMap（）来获取 Map< String，Map< String，Integer>> ，它将以表格 {A = {B = 1，C = 2}，B = {D = 3}} 表示表格中的数据。然后只需迭代这个地图就像：

Im not Guava user so this may be overkill (if it is true then will be glad for any info) but you can use table.rowMap() to get Map<String, Map<String, Integer>> which will represents data in table in form {A={B=1, C=2}, B={D=3}}. Then just iterate over this map like:

Map<String, Map<String, Integer>> map = table.rowMap();

for (String row : map.keySet()) {
    Map<String, Integer> tmp = map.get(row);
    for (Map.Entry<String, Integer> pair : tmp.entrySet()) {
        System.out.println(row+" "+pair.getKey()+" "+pair.getValue());
    }
}

或

for (Map.Entry<String, Map<String,Integer>> outer : map.entrySet()) {
    for (Map.Entry<String, Integer> inner : outer.getValue().entrySet()) {
        System.out.println(outer.getKey()+" "+inner.getKey()+" "+inner.getValue());
    }
}

甚至更好地使用 com .google.common.collect.Table.Cell

for (Cell<String, String, Integer> cell: table.cellSet()){
    System.out.println(cell.getRowKey()+" "+cell.getColumnKey()+" "+cell.getValue());
}

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