Question

正如标题所说，我希望每行（每System.out.print）存储一个数组/ arrayList。到目前为止，我已经尝试ByteArrayOutputStream，但它只将所有内容都附加到一个对象中。如有必要，我很乐意发布代码片段。对不起noob问题

编辑代码：

ByteArrayOutputStream baos = new ByteArrayOutputStream();
PrintStream ps = new PrintStream(baos);
PrintStream old = System.out;
String[] str= new String[10];

System.setOut(ps);

for(int x=0;x<str.length;x++){
ps.println("Test: "+x);
str[x] = baos.toString();
}
System.out.flush();
System.setOut(old);
for(int x=0;x<str.length;x++){
System.out.println(str[x]);
}

输出：

Test: 0

Test: 0
Test: 1

Test: 0
Test: 1
Test: 2

Test: 0
Test: 1
Test: 2
Test: 3

Test: 0
Test: 1
Test: 2
Test: 3
Test: 4

Test: 0
Test: 1
Test: 2
Test: 3
Test: 4
Test: 5

Test: 0
Test: 1
Test: 2
Test: 3
Test: 4
Test: 5
Test: 6

Test: 0
Test: 1
Test: 2
Test: 3
Test: 4
Test: 5
Test: 6
Test: 7

Test: 0
Test: 1
Test: 2
Test: 3
Test: 4
Test: 5
Test: 6
Test: 7
Test: 8

Test: 0
Test: 1
Test: 2
Test: 3
Test: 4
Test: 5
Test: 6
Test: 7
Test: 8
Test: 9

我想在str数组中拥有的内容是这样的：

str[0] = "Test: 0"
str[1] = "Test: 1"
str[2] = "Test: 2"
str[3] = "Test: 3"
str[4] = "Test: 4"
str[5] = "Test: 5"
str[6] = "Test: 6"
str[7] = "Test: 7"
str[8] = "Test: 8"
str[9] = "Test: 9"

我也寻找删除ByteArrayOutputStream内的值但没有运气的东西。

Answer 1

根据您发布的代码，我做了一些修改，看看这是否是您要找的。

ByteArrayOutputStream baos = new ByteArrayOutputStream();
PrintStream ps = new PrintStream(baos);
PrintStream old = System.out;
String[] str= new String[10];

System.setOut(ps);

for(int x=0;x<str.length;x++){
ps.println("Test: "+x);
str[x] = baos.toString();
baos.reset();
}
System.out.flush();
System.setOut(old);
for(int x=0;x<str.length;x++){
System.out.println(str[x]);
}

诀窍在于，每次执行第str[x] = baos.toString()行时，累积的输出仍然存在，因此您需要使用reset()来丢弃累积的数据，有关reset()的详细信息，请参阅官方文件here

在数组中每行存储控制台输出

1 个答案: