Java数组、list的转化合并
程序员文章站
2022-04-15 11:29:25
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昨天偶换了一个小方法来实现Java数组、List的转化、合并,并在新数组的第一位置入自己想要或已定的数据变量/对象,代码如下:
//preCondition List list1 = new ArrayList(); List list2 = new ArrayList(); list1.add("test1"); list1.add("test2"); list2.add(1); list2.add(2); String temp = "TEMP"; //first:get arrays from list Object[] array1 = list1.toArray(); Object[] array2 = list2.toArray(); //second:get new array that length is list1.size+list2.size Object[] obj = Arrays.copyOf(array1, list1.size()+list2.size()+1); for (int j=0; j<=array1.length; j++) obj[j] = j==0?temp:array1[j-1];//add temp into obj[0] //third:add array2's data into obj[] for(int i=0; i<array2.length; i++) obj[obj.length-i-1] = array2[array2.length-i-1];