Java 数组打印出奇怪的数字和文本
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Java arrays printing out weird numbers and text
提问by Racket
I'm new to programming. I'm sure the answer for this question is out there, but I have no idea what to search for.
我是编程新手。我确定这个问题的答案就在那里，但我不知道要搜索什么。
Ok, I'll go right to it.
好的，我马上去。
Here's my code:
这是我的代码：
int[] arr;
arr = new int[5];
arr[0] = 20;
arr[1] = 50;
arr[2] = 40;
arr[3] = 60;
arr[4] = 100;
System.out.println(arr);
This compiles and works fine. It's just the output from CMD that I'm dizzy about.
这编译并正常工作。这只是 CMD 的输出让我头晕目眩。
This is the output: [I@3e25a5.
这是输出：[I@3e25a5。
I want the output to represent the exact same numbers from the list (arr) instead. How do I make that happen?
我希望输出代表列表 ( arr) 中完全相同的数字。我该如何做到这一点？
回答by Goran Jovic
It's the default string representation of array (the weird text).
它是数组的默认字符串表示（奇怪的文本）。
You'll just have to loop through it:
你只需要遍历它：
for(int i : arr){
System.out.println(i);
}
回答by duffymo
Like this:
像这样：
for (int i = 0; i < arr.length; ++i)
{
System.out.println(arr[i]);
}
That "weird number" is the reference for the array you printed out. It's the default behavior built into the java.lang.Object toString() method.
这个“奇怪的数字”是您打印出的数组的参考。这是内置在 java.lang.Object toString() 方法中的默认行为。
You should override it in your own objects if seeing the reference isn't sufficient.
如果看到引用还不够，您应该在您自己的对象中覆盖它。
回答by Enrique
To print the values use.
要打印值，请使用。
for(int i=0; i<arr.length; i++)
System.out.println(arr[i]);
回答by Hovercraft Full Of Eels
Every object has a toString()method, and the default method is to display the object's class name representation, then @followed by its hashcode. So what you're seeing is the default toString()representation of an intarray. To print the data in the array, you can use:
每个对象都有一个toString()方法，默认方法是显示对象的类名表示，然后@是其哈希码。所以你看到的是数组的默认toString()表示int。要打印数组中的数据，您可以使用：
System.out.println(java.util.Arrays.toString(arr));
Or, you can loop through the array with a forloop as others have posted in this thread.
或者，您可以for像其他人在此线程中发布的那样使用循环遍历数组。
回答by Emil
System.out.println(Arrays.toString(arr));
The current output is classtype@hashcode.
当前输出为classtype@hashcode。
Incase you need to print arrays with more than one dimension use:
如果您需要打印多维数组，请使用：
Arrays.deepToString(arr);
Also remember to override toString()method for user-defined classes so that you get a representation of the objet as you choose and not the default represention which is classtype@hashcode
还要记住覆盖toString()用户定义类的方法，以便您在选择时获得对象的表示，而不是默认表示classtype@hashcode
回答by EnabrenTane
You printed the reference and not the values at the reference... One day it will all become clear with C.
您打印的是参考而不是参考中的值……总有一天，C 会变得清晰。
回答by Oswald
for (int i = 0; i < arr.length; ++i)
{
System.out.println(arr[i]);
}
回答by user547215
It prints it's .toString() method you should print each element
它打印它的 .toString() 方法你应该打印每个元素
for(int i=0; i<arr.length; i++) {
System.out.println(arr[i]);
}
or
for(Integer i : arr) {
System.out.println(i);
}
回答by Peter Lawrey
BTW You can write
BTW 你可以写
int[] arr = { 20, 40, 60, 40, 60, 100 };
System.out.println(Arrays.toString(array));
or even
甚至
System.out.println(Arrays.toString(new int[] { 20, 40, 60, 40, 60, 100 }));
or
或者
System.out.println(Arrays.asList(20, 40, 60, 40, 60, 100));
回答by Anton Dozortsev
My version of a shorter!
我的版本更短！
Use Arrays.toString()and PrintStream.printf(String format, Object... args).
使用Arrays.toString()和PrintStream.printf(String format, Object... args)。
System.out.printf("%s%n", Arrays.toString(arr));
