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Commit 173b9fc

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Merge pull request giantray#21 from tangculijier/master
Create What's-the-simplest-way-to-print-a-Java-array.md
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给3个布尔变量,当其中有2个或者2个以上为true菜返回true
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===
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问题
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给3个boolean变量,a,b,c,当其中有2个或2个以上为true时才返回true?
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最笨的方法:
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```java
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boolean atLeastTwo(boolean a, boolean b, boolean c)
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{
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if ((a && b) || (b && c) || (a && c))
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{
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return true;
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}
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else
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{
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return false;
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}
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}
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```
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* 优雅解法1
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```java
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return a ? (b || c) : (b && c);
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```
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* 优雅解法2
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```java
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return (a==b) ? a : c;
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```
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* 优雅解法3
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```java
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return a ^ b ? c : a
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```
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* 优雅解法4
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```java
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return a ? (b || c) : (b && c);
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```
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stackoverflow链接: http://stackoverflow.com/questions/3076078/check-if-at-least-two-out-of-three-booleans-are-true
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java中打印一个数组最简单的方法是什么
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===
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问题
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---
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在java中,数组没有重写toString()方法,所以我如果直接调用数组toStrign()方法的话,我会知道得到它的内存地址。像这样:
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```java
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int[] intArray = new int[] {1, 2, 3, 4, 5};
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System.out.println(intArray); // 有时候会输出 '[I@3343c8b3'
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```
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但是实际上我想要的输出效果是
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```java
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[1, 2, 3, 4, 5]
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```
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所以打印一个数组最简单的方法是什么?我想要的效果是
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```java
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// 数字数组:
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int[] intArray = new int[] {1, 2, 3, 4, 5};
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//输出: [1, 2, 3, 4, 5]
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// 对象数组:
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String[] strArray = new String[] {"John", "Mary", "Bob"};
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//输出: [John, Mary, Bob]
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```
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回答
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---
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在JAVA5中使用 Arrays.toString(arr) 或 Arrays.deepToString(arr)来打印数组。
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不要忘了引入import java.util.Arrays;
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```java
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package packageName;
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import java.util.Arrays;
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```
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```java
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int[] intArray = new int[] {1, 2, 3, 4, 5};
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System.out.println(Arrays.toString(intArray));
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//输出: [1, 2, 3, 4, 5]
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String[] strArray = new String[] {"John", "Mary", "Bob"};
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System.out.println(Arrays.deepToString(strArray));
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*//输出: [John, Mary, Bob]
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```
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Arrays.deepToString与Arrays.toString不同之处在于,Arrays.deepToString更适合打印多维数组<br>
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比如: <br>
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```java
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String[][] b = new String[3][4];
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for (int i = 0; i < 3; i++)
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{
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for (int j = 0; j < 4; j++)
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{
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b[i][j] = "A" + j;
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}
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}
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System.out.println(Arrays.toString(b));
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//输出[[Ljava.lang.String;@55e6cb2a, [Ljava.lang.String;@23245e75, [Ljava.lang.String;@28b56559]
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System.out.println(Arrays.deepToString(b));
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//输出[[A0, A1, A2, A3], [A0, A1, A2, A3], [A0, A1, A2, A3]]
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```
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stackoverflow链接: http://stackoverflow.com/questions/409784/whats-the-simplest-way-to-print-a-java-array

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