e1072. filling elements in an array.txt

来自「这里面包含了一百多个JAVA源文件」· 文本 代码 · 共 54 行

The Arrays class has conveninent methods for filling arrays of all eight primitive types: 
    boolean[] booleanArr = new boolean[10];
    boolean booleanFillValue = false;
    Arrays.fill(booleanArr, booleanFillValue);
    
    byte[] byteArr = new byte[10];
    byte byteFillValue = (byte)0xFF;
    Arrays.fill(byteArr, byteFillValue);
    
    char[] charArr = new char[10];
    char charFillValue = 0xFF;
    Arrays.fill(charArr, charFillValue);
    
    short[] shortArr = new short[10];
    short shortFillValue = 0xFF;
    Arrays.fill(shortArr, shortFillValue);
    
    int[] intArr = new int[10];
    int intFillValue = -1;
    Arrays.fill(intArr, intFillValue);
    
    long[] longArr = new long[10];
    long longFillValue = -1;
    Arrays.fill(longArr, longFillValue);
    
    float[] floatArr = new float[10];
    float floatFillValue = -1;
    Arrays.fill(floatArr, floatFillValue);
    
    double[] doubleArr = new double[10];
    double doubleFillValue = -1;
    Arrays.fill(doubleArr, doubleFillValue);

There is also a method for filling object arrays: 
    String[] StringArr = new String[1];
    String StringFillValue = "";
    Arrays.fill(StringArr, StringFillValue);

By default, the nine fill methods shown above set all the elements in the array with the fill value. Each fill method has an overloaded version that can restrict the fill to a contiguous range of elements: 
    // Fill elements 0, 1, 2, and 3; the end index is exclusive
    int startIndex = 0;
    int endIndex = 4;
    
    Arrays.fill(booleanArr, startIndex, endIndex, booleanFillValue);
    Arrays.fill(byteArr, startIndex, endIndex, byteFillValue);
    Arrays.fill(charArr, startIndex, endIndex, charFillValue);
    Arrays.fill(shortArr, startIndex, endIndex, shortFillValue);
    Arrays.fill(intArr, startIndex, endIndex, intFillValue);
    Arrays.fill(longArr, startIndex, endIndex, longFillValue);
    Arrays.fill(floatArr, startIndex, endIndex, floatFillValue);
    Arrays.fill(doubleArr, startIndex, endIndex, doubleFillValue);
    Arrays.fill(StringArr, startIndex, endIndex, StringFillValue);