我有这段代码：
public String toString(Day day)
{
String s = day.getDayName() + " " + day.toString();
return s;
}
这是Day类的toString方法：
public String toString()
{
String s = "";
for (Slot slot: slots)
s += slot.toString();
return s;
}
一遍又一遍地打电话打印：
barbi
monday 10: X 11: 12: 2: 3: 4:
tuesday 10: 11: 12: 2: 3: 4: X
wednesday 10: 11: 12: 2: 3: 4:
thursday 10: 11: 12: 2: 3: 4:
friday 10: 11: 12: 2: 3: 4:
bobbi
monday 10: 11: 12: 2: 3: 4:
tuesday 10: 11: 12: 2: 3: 4:
wednesday 10: 11: 12: 2: 3: 4:
thursday 10: 11: 12: 2: X 3: 4:
friday 10: 11: 12: 2: 3: 4:
bunny
monday 10: 11: 12: 2: 3: 4:
tuesday 10: 11: 12: 2: 3: 4:
wednesday 10: 11: 12: 2: 3: 4:
thursday 10: 11: 12: 2: 3: 4:
friday 10: 11: 12: 2: 3: 4:
但是，我想以这种方式打印：
barbi, income is $95.00 Monday 10: 11: 12: X 2: 3: 4: Tuesday 10: 11: 12: 2: 3: 4: Wednesday 10: 11: 12: 2: 3: 4: Thursday 10: 11: 12: 2: 3: 4: Friday 10: 11: 12: 2: 3: 4: bobbi, income is $45.00 Monday 10: 11: 12: 2: 3: 4: Tuesday 10: 11: 12: 2: 3: X 4: Wednesday 10: 11: 12: 2: 3: 4: Thursday 10: 11: 12: 2: 3: 4: Friday 10: 11: 12: 2: 3: 4: bunny, income is $0.00 Monday 10: 11: 12: 2: 3: 4: Tuesday 10: 11: 12: 2: 3: 4: Wednesday 10: 11: 12: 2: 3: 4: Thursday 10: 11: 12: 2: 3: 4: Friday 10: 11: 12: 2: 3: 4:
我知道这适用于Java中的格式化打印。但我不知道该怎么做。
答案 0 :(得分：5)
您可以使用String.format()，这将接受宽度。
我认为你可以改变：
String s = day.getDayName() + " " + day.toString();
为：
return String.format("%9s %s", day.getDayName(), day.toString());
得到你想要的东西。
答案 1 :(得分：3)
String[][] kvs = {
{ "Name", "Johnny" },
{ "Age", "19" },
{ "Sex", "Female" },
};
for (String[] kv : kvs) {
System.out.println(
String.format("%-10s:%10s", kv[0], kv[1])
);
}
打印：
Name : Johnny
Age : 19
Sex : Female
%[flags][width]conversion
-是左对齐的标志s是String转化String连接请注意，您绝不应在循环中使用String构建+=。您应该使用StringBuilder代替。
StringBuilder sb = new StringBuilder();
for (Slot slot: slots) {
sb.append(slot.toString());
}
return sb.toString();
答案 2 :(得分：0)
你检查过java.util.Formatter吗？它的价格是1.5 btw。