printf("%3d, ...) 在 eclipse juno 上不工作

Question

package p;

import java.io.*;
public class fifo {

    public static void main(String[] args) throws IOException 
    {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        int frames = 3, pointer = 0, fault = 0, reflen, def = 0;
        int spaces[];
        int reference[];
        int mem_layout[][];

        System.out.println("Reference String Length: ");
        reflen = Integer.parseInt(br.readLine());


        reference = new int[reflen];
        mem_layout = new int[reflen][frames];
        spaces = new int[frames];
        for(int j = 0; j < frames; j++)
                spaces[j] = 0;

        System.out.println("Reference Numbers: ");
        for(int i = 0; i < reflen; i++)
        {
            reference[i] = Integer.parseInt(br.readLine());      
        }
        System.out.println();
        for(int i = 0; i < reflen; i++)
        {
         int search = -1;
         for(int j = 0; j < frames; j++)
         {
          if(spaces[j] == reference[i])
          {
           search = j;
           def++;
           break;
          } 
         }
         if(search == -1)
         {
          spaces[pointer] = reference[i];
          fault++;
          pointer++;
          if(pointer == frames)
           pointer = 0 ;
         }
            for(int j = 0; j < frames; j++)
                mem_layout[i][j] = spaces[j];
        }

        for(int i = 0; i < frames; i++)
        {
            for(int j = 0; j < reflen; j++)
                //System.out.printf("%3d ", reference);
                System.out.printf("%3d ",mem_layout[j][i]); //ERROR UNDER PRINTF
            System.out.println();
        }

        System.out.println("Fault: " + fault);
        System.out.println("Default: " + def);
        System.out.println("Page Fault Rate: " + fault + "/" + reflen + " = " + ((double)fault/reflen)*100 + "%" );
    }

}

So we are told to continue our work at home. The code is working fine in our computer lab that is using another version of eclipse. Im using a juno and printf doesn't work anymore. Please help the submission is tomorrow i don't know why it doesn't work anymore.

juno 过时了吗？我尝试执行消除错误的 eclipse 建议，但它会产生更多错误哈哈 :(

Answer 1

尝试 System.out.format(); 而不是 System.out.printf();
尝试安装他们在实验室使用的另一个 Eclipse 版本
请告诉我们 error/exception Eclipse 显示的是什么

Answer 2

在评论中，您说错误信息是这样的：

The method format(String, Object[])in the type PrintStream is not applicable for the arguments (String, int)

这很奇怪。但是，一种可能的解释是您的 Eclipse 设置选择了 Java 的真正旧版本。在 Java 1.5 之前，不支持自动装箱。这会阻止编译器将 int 自动装箱为 Integer。

启动 Eclipse 并打开 Window> 首选项。 Select Java>编译器首选项。看"Compiler compliance level"设置是，把它改成“1.8”。

然后使用 Project>Clean 重新编译所有内容。

你也可以改变这个：

System.out.printf("%3d ", mem_layout[j][i]);

对此：

System.out.printf("%3d ", new Object[]{
                             Integer.valueOf(mem_layout[j][i])});

这使得源代码与旧的 Java 编译器兼容。但这是一个糟糕的解决方案，IMO。

printf("%3d, ...) 在 eclipse juno 上不工作

printf("%3d, ...) not working on eclipse juno

java

fifo