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                ## Arrays的fill方法 通常情況下,當對數組和程序進行實驗時,能夠很輕易地生成充滿測試數據的數組是很有幫助的。 Java 標準庫 **Arrays** 類包括一個普通的 **fill()** 方法,該方法將單個值復制到整個數組,或者在對象數組的情況下,將相同的引用復制到整個數組: ```Java // arrays/FillingArrays.java // Using Arrays.fill() import java.util.*; import static onjava.ArrayShow.*; public class FillingArrays { public static void main(String[] args) { int size = 6; boolean[] a1 = new boolean[size]; byte[] a2 = new byte[size]; char[] a3 = new char[size]; short[] a4 = new short[size]; int[] a5 = new int[size]; long[] a6 = new long[size]; float[] a7 = new float[size]; double[] a8 = new double[size]; String[] a9 = new String[size]; Arrays.fill(a1, true); show("a1", a1); Arrays.fill(a2, (byte)11); show("a2", a2); Arrays.fill(a3, 'x'); show("a3", a3); Arrays.fill(a4, (short)17); show("a4", a4); Arrays.fill(a5, 19); show("a5", a5); Arrays.fill(a6, 23); show("a6", a6); Arrays.fill(a7, 29); show("a7", a7); Arrays.fill(a8, 47); show("a8", a8); Arrays.fill(a9, "Hello"); show("a9", a9); // Manipulating ranges: Arrays.fill(a9, 3, 5, "World"); show("a9", a9); } }gedan /* Output: a1: [true, true, true, true, true, true] a2: [11, 11, 11, 11, 11, 11] a3: [x, x, x, x, x, x] a4: [17, 17, 17, 17, 17, 17] a5: [19, 19, 19, 19, 19, 19] a6: [23, 23, 23, 23, 23, 23] a7: [29.0, 29.0, 29.0, 29.0, 29.0, 29.0] a8: [47.0, 47.0, 47.0, 47.0, 47.0, 47.0] a9: [Hello, Hello, Hello, Hello, Hello, Hello] a9: [Hello, Hello, Hello, World, World, Hello] */ ``` 你既可以填充整個數組,也可以像最后兩個語句所示,填充一系列的元素。但是由于你只能使用單個值調用 **Arrays.fill()** ,因此結果并非特別有用。
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