java - 右对齐整数 (Java)

Question

我想格式化表格，如 here 所示。但我在右对齐整数时遇到问题。如图所示，顶部的前四行，整数右对齐。有没有办法通过 System.out.printf() 或 String.format() 来对齐整数？到目前为止我尝试做的事情与此类似；但它不一样。整数左对齐。

        String line = String.format("\n\nREGISTERS:\n");
    line += String.format("%-21s %+05d\n%-21s %02d\n%-21s %+05d\n%-21s %02d\n%-21s %02d\n\n","accumulator",accum,
            "instructionCounter",instructionCounter,"instructionRegister",instructionRegister,"operationCode",operationCode,"operand",operand);
    line += (String.format("MEMORY:\n"));
    line += (String.format("%5d%5d%5d%5d%5d%5d%5d%5d%5d%5d\n",0,1,2,3,4,5,6,7,8,9));



    for(int i = 0; i < memory.length; i += 10){
        line += String.format("%2d ", i);
        for(int j = i; j < i+9; j++){
            line += String.format("%+05d ", memory[j]);
        }
        line += "\n";
    }

Answer 1

一种方法可能是通过将 String.format() 传递给自身来将整数格式化为字符串，如下所示: String.format("'%5s'", String.format("%02d", instructionsCounter))
所以你的代码中的那一行就变成了这样:

line += String.format("%-21s%+05d\n%-21s%6s%-21s%+05d\n%-21s%6s%-21s%6s",
                              "accumulator",accum,
                              "instructionCounter",String.format("%02d\n", instructionCounter),
                              "instructionRegister",instructionRegister,
                              "operationCode",String.format("%02d\n", operationCode),
                              "operand",String.format("%02d\n", operand) );

产生输出:

REGISTERS:
accumulator          +0000
instructionCounter      00
instructionRegister  +0000
operationCode           00
operand                 00

希望这有帮助!