如何从 ArrayList<String[]>
获取或打印字符串?
ArrayList<String[]> arrayList = new ArrayList<>();
arrayList.add(new String[]{"A1","A1","A3"});
arrayList.add(new String[]{"B1","B1","B3"});
arrayList.add(new String[]{"C1","C1","C3"});
System.out.println("*** 1 ***");
System.out.println(arrayList);
System.out.println("*** 2 ***");
for (int i = 0; i < arrayList.size(); i++) {
System.out.println((String[])arrayList.get(i));
}
System.out.println("*** 3 ***");
for (int i = 0; i < arrayList.size(); i++) {
System.out.println(arrayList.get(i).toString());
}
System.out.println("*** 4 ***");
for (int i = 0; i < arrayList.size(); i++) {
String[] strings = arrayList.get(i);
System.out.println(strings);
}
输出:
*** 1 ***
[[Ljava.lang.String;@2a85f3d6, [Ljava.lang.String;@404b7c69, [Ljava.lang.String;@1bd4f279]
*** 2 ***
[Ljava.lang.String;@2a85f3d6
[Ljava.lang.String;@404b7c69
[Ljava.lang.String;@1bd4f279
*** 3 ***
[Ljava.lang.String;@2a85f3d6
[Ljava.lang.String;@404b7c69
[Ljava.lang.String;@1bd4f279
*** 4 ***
[Ljava.lang.String;@2a85f3d6
[Ljava.lang.String;@404b7c69
[Ljava.lang.String;@1bd4f279
最佳答案
遗憾的是,java 对于数组的默认 toString()
是无用的。您必须使用实用程序方法 Arrays.toString()
。这将起作用:
for (String[] strings : arrayList)
System.out.println(Arrays.toString(strings));
关于java - 如何从 ArrayList<String[]> 获取值,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/21073853/