查找Java数组的和
我必须制作一个程序来读取一个文件,并记录每个可打印字符的数量。我把它都记下来了,除了在最后我需要显示可打印字符的总量。我不知道如何将所有数组值相加得到:
public static void main(String[] args) throws IOException {
final int NUMCHARS = 95;
int[] chars = new int[NUMCHARS];
char current; // the current character being processed
// set up file output
FileWriter fw = new FileWriter("output.txt"); // sets up a file for output
BufferedWriter bw = new BufferedWriter(fw); // makes the output more efficient. We use the FileWriter (fw) created in previous line
PrintWriter outFile = new PrintWriter(bw); // adds useful methods such as print and println
// set up file for input using JFileChooser dialog box
JFileChooser chooser = new JFileChooser(); // creates dialog box
int status = chooser.showOpenDialog(null); // opens it up, and stores the return value in status when it closes
Scanner scan;
if(status == JFileChooser.APPROVE_OPTION)
{
File file = chooser.getSelectedFile();
scan = new Scanner (file);
}
else
{
JOptionPane.showMessageDialog(null, "No File Choosen", "Program will Halt", JOptionPane.ERROR_MESSAGE);
outFile.close();
return;
}
while(scan.hasNextLine())
{
String line = scan.nextLine();
// Count the number of each letter occurrence
for (int ch = 0; ch < line.length(); ch++)
{
current = line.charAt(ch);
chars[current-' ']++;
}
// Print the results
for (int letter=0; letter < chars.length; letter++)
{
if(chars[letter] >= 1)
{
outFile.print((char) (letter + ' '));
outFile.print(": " + chars[letter]);
outFile.println();
}
}
}
outFile.close();
scan.close(); }
# 1 楼答案
根据你的问题,我不确定你是在问数组中的项目总数还是数组中所有值的总和
如果您正在寻找总和,请使用以下方法:
如果要查找数组中的项目总数,只需使用
array.length