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Commit 36042a4

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如何便捷地将两个数组合到一起
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‎README.md‎

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* [如何分割(split)string字符串](https://github.com/giantray/stackoverflow-java-top-qa/blob/master/contents/how-to-split-a-string-in-java.md)
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* [在java中如何对比(compare)string](https://github.com/giantray/stackoverflow-java-top-qa/blob/master/contents/how-do-i-compare-strings-in-java.md)
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* [`Map<Key,Value>`基于Value值排序](https://github.com/giantray/stackoverflow-java-top-qa/blob/master/contents/how-to-sort-a-mapkey-value-on-the-values-in-java.md)
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* [如何便捷地将两个数组合到一起](https://github.com/giantray/stackoverflow-java-top-qa/blob/master/contents/how-to-concatenate-two-arrays-in-java.md)
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> 编程技巧
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- [Comparing Java enum members: == or equals()?](http://stackoverflow.com/questions/1750435/comparing-java-enum-members-or-equals)
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- [Failed to load the JNI shared Library (JDK)](http://stackoverflow.com/questions/7352493/failed-to-load-the-jni-shared-library-jdk)
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- [Does Java support default parameter values?](http://stackoverflow.com/questions/997482/does-java-support-default-parameter-values)
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- [How to concatenate two arrays in Java?](http://stackoverflow.com/questions/80476/how-to-concatenate-two-arrays-in-java)
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- [What's the simplest way to print a Java array?](http://stackoverflow.com/questions/409784/whats-the-simplest-way-to-print-a-java-array)
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- [Why can't I switch on a String?](http://stackoverflow.com/questions/338206/why-cant-i-switch-on-a-string)
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- [How to create a Java String from the contents of a file?](http://stackoverflow.com/questions/326390/how-to-create-a-java-string-from-the-contents-of-a-file)
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##如何便捷地将两个数组合到一起
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###一行代码搞定
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Apache Commons Lang library [`ArrayUtils.addAll(T[], T...)`](http://commons.apache.org/proper/commons-lang/javadocs/api-3.1/org/apache/commons/lang3/ArrayUtils.html#addAll%28T%5B%5D,%20T...%29)就是专门干这事的
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代码:
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```java
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String[] both = ArrayUtils.addAll(first, second);
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```
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###不借助依赖包
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####非泛型
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把下面的`Foo`替换成你自己的类名
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```java
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public Foo[] concat(Foo[] a, Foo[] b) {
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int aLen = a.length;
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int bLen = b.length;
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Foo[] c= new Foo[aLen+bLen];
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System.arraycopy(a, 0, c, 0, aLen);
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System.arraycopy(b, 0, c, aLen, bLen);
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return c;
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}
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```
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####泛型
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```java
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public <T> T[] concatenate (T[] a, T[] b) {
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int aLen = a.length;
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int bLen = b.length;
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@SuppressWarnings("unchecked")
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T[] c = (T[]) Array.newInstance(a.getClass().getComponentType(), aLen+bLen);
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System.arraycopy(a, 0, c, 0, aLen);
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System.arraycopy(b, 0, c, aLen, bLen);
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return c;
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}
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```
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注意,泛型的方案不适用于基本数据类型(int,boolean......)

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