Java数组和拆分方法

首先，val由于while循环，文件中的每个新行都将覆盖对先前数组的引用，因此，在完全读取文件后，您无法访问从split（）返回的第一行和第二行的数组。可以使用一个二维双精度数组来存储读取（和解析（2））的值（1），然后从该数组中乘以相应的三个值以获得结果（3）：

    String currLine = null;
    int numberOfEntries = 0;
    double[][] values = new double[3][];    // (1)
    for ( int i = 0; i < 3 && ( currLine = textReader.readLine() ) != null; i++ ) {
        String[] valuesInLine = currLine.split( " " );

        // Check whether every line contains the same number of numbers (except for first iteration)
        if ( i != 0 && numberOfEntries != valuesInLine.length ) {
            // for instance throw an exception...
        }

        numberOfEntries = valuesInLine.length;
        double[] valuesInLineParsed = new double[numberOfEntries];
        for ( int j = 0; j < numberOfEntries; j++ )
            valuesInLineParsed[j] = Double.parseDouble( valuesInLine[j] );        // (2)

        values[i] = valuesInLineParsed;
    }

    // Check whether the previous for loop counted to 3 and did not abort because of textReader.readLine() returning null
    if ( currLine != null ) {
        double[] results = new double[numberOfEntries];
        for ( int i = 0; i < numberOfEntries; i++ )
            results[i] = values[0][i] * values[1][i] * values[2][i];        // (3)

        System.out.println( Arrays.toString( results ) );
    }

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