Java合并数组的实现方式

String[] aa = {"11","22","33"};
String[] bb = {"44","55","66"};
String[] cc = {"77","88","99"};

// 合并两个数组
String[] dd = new String[aa.length + bb.length];
System.arraycopy(aa, 0, dd, 0, aa.length);
System.arraycopy(bb, 0, dd, aa.length, bb.length);

结果如下：

// 合并三个数组
String[] ee = new String[aa.length + bb.length + cc.length];
System.arraycopy(aa, 0, ee, 0, aa.length);
System.arraycopy(bb, 0, ee, aa.length, bb.length);
System.arraycopy(cc, 0, ee, aa.length + bb.length, cc.length);
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