java 遍歷Map及Map轉(zhuǎn)化為二維數(shù)組的實(shí)例
實(shí)例代碼：
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import java.util.HashMap; import java.util.Iterator; import java.util.Map; public class Test { public static void main(String[] args) { int a = 0, b = 0, c = 0; // 第一種:通過Map.keySet()遍歷Map及將Map轉(zhuǎn)化為二維數(shù)組 Map<String, String> map1 = new HashMap<String, String>(); map1.put("012013012013", "張三"); map1.put("012013012014", "張四"); String[][] group1 = new String[map1.size()][2]; System.out.println("第一種:通過Map.keySet()遍歷map1的key和value"); for (String key : map1.keySet()) { System.out.println("key = " + key + " and value = " + map1.get(key)); group1[a][0] = key; group1[a][1] = map1.get(key); a++; } System.out.println("map1.size()為：" + map1.size() + ",a為：" + a + "，group1數(shù)組的長度為：" + group1.length); System.out.println("----------------------------------------------------"); for(int n = 0; n < group1.length; n++) { System.out.println("key = " + group1[n][0] + " and value = " + group1[n][1]); } // 第二種:通過Map.entrySet()使用iterator()遍歷Map及將Map轉(zhuǎn)化為二維數(shù)組 Map<String, String> map2 = new HashMap<String, String>(); map2.put("112013012013", "李三"); map2.put("112013012014", "李四"); System.out.println("\n" + "第二種:通過Map.entrySet()使用iterator()遍歷map2的key和value"); Iterator<Map.Entry<String, String>> iterator = map2.entrySet().iterator(); String[][] group2 = new String[map2.size()][2]; while (iterator.hasNext()) { Map.Entry<String, String> entry = iterator.next(); System.out.println("key = " + entry.getKey() + " and value = " + entry.getValue()); group2[b][0] = entry.getKey(); group2[b][1] = entry.getValue(); b++; } System.out.println("map2.size()為：" + map2.size() + ",b為：" + b + "，group2數(shù)組的長度為：" + group2.length); System.out.println("----------------------------------------------------"); for(int n = 0; n < group2.length; n++) { System.out.println("key = " + group2[n][0] + " and value = " + group2[n][1]); } // 第三種:通過Map.entrySet()遍歷遍歷Map及將Map轉(zhuǎn)化為二維數(shù)組 Map<String, String> map = new HashMap<String, String>(); map.putAll(map1); map.putAll(map2); String[][] group3 = new String[map.size()][2]; System.out.println("\n" + "第三種:通過Map.entrySet()遍歷map的key和value "); for (Map.Entry<String, String> entry : map.entrySet()) { System.out.println("key = " + entry.getKey() + " and value = " + entry.getValue()); group3[c][0] = entry.getKey(); group3[c][1] = entry.getValue(); c++; } System.out.println("map.size()為：" + map.size() + ",c為：" + c + "，group3數(shù)組的長度為：" + group3.length); System.out.println("----------------------------------------------------"); for(int n = 0; n < group3.length; n++) { System.out.println("key = " + group3[n][0] + " and value = " + group3[n][1]); } } } |
輸出結(jié)果為：
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第一種:通過Map.keySet()遍歷map1的key和value key = 012013012013 and value = 張三 key = 012013012014 and value = 張四 map1.size()為：2,a為：2，group1數(shù)組的長度為：2---------------------------------------------------- key = 012013012013 and value = 張三 key = 012013012014 and value = 張四 第二種:通過Map.entrySet()使用iterator()遍歷map2的key和value key = 112013012014 and value = 李四 key = 112013012013 and value = 李三 map2.size()為：2,b為：2，group2數(shù)組的長度為：2---------------------------------------------------- key = 112013012014 and value = 李四 key = 112013012013 and value = 李三 第三種:通過Map.entrySet()遍歷map的key和value key = 112013012014 and value = 李四 key = 112013012013 and value = 李三 key = 012013012013 and value = 張三 key = 012013012014 and value = 張四 map.size()為：4,c為：4，group3數(shù)組的長度為：4---------------------------------------------------- key = 112013012014 and value = 李四 key = 112013012013 and value = 李三 key = 012013012013 and value = 張三 key = 012013012014 and value = 張四 |
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原文鏈接：http://blog.csdn.net/caihuangshi/article/details/17552933
