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                #### 主要API * boolean equals\(type\[\] a, type\[\] a2\); 只有兩個數組長度相等,并且每個元素也對應相等時才會返回true * type\[\] copyOf\(type\[\] original, int length\); 賦值original數組的前length個元素形成一個新數組返回,如果length大于original的長度,那么多出來的部分系統自動賦予默認值(0/null) * void fill\(type\[\] a, type val\); // 整個數組填充val * void fill\(type\[\] a, int fromIndex, int toIndex, type val\); // 區間填充 * String toString\(type\[\] a\); // 分別調用各個元素的toString,將各個結果連綴成一個完整的String返回,中間用", "(逗號+空格分隔); * sort\(int\[\] a\) // 排序\(內部使用優化的快速排序算法\) * parallelSort\(nums\); //并行排序 * binarySearch\(int\[\] a, int key\)使用二分法查找元素\(注意使用前必須先排序\) * deepToString\(Object\[\] a\)將二維數組轉換為String * Arrays.hashCode方法計算一個散列碼,這個散列碼由數組元素的散列碼組成 ### Arrays.copyOf\(\) * original - 要復制的數組 * newLength - 要返回的副本的長度 * newType - 要返回的副本的類型 ``` public static <T,U> T[] copyOf(U[] original, int newLength, Class<? extends T[]> newType) { @SuppressWarnings("unchecked") T[] copy = ((Object)newType == (Object)Object[].class) ? (T[]) new Object[newLength] : (T[]) Array.newInstance(newType.getComponentType(), newLength); System.arraycopy(original, 0, copy, 0, Math.min(original.length, newLength)); return copy; } ```
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