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修改格式

代码块的格式修改

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Original file line number	Diff line number	Diff line change
`@@ -5,7 +5,7 @@`
`5`	`5`	`第一个矩阵:O和#`
`6`	`6`	`第二个矩阵:O和B`
`7`	`7`	`使用一下代码,第一个矩阵仅用时8.25s就完成了:`
`8`		-`
	`8`	+```java
`9`	`9`	`Random r = new Random();`
`10`	`10`	`for (int i = 0; i < 1000; i++) {`
`11`	`11`	`for (int j = 0; j < 1000; j++) {`
`@@ -18,9 +18,9 @@ for (int i = 0; i < 1000; i++) {`
`18`	`18`
`19`	`19`	`System.out.println("");`
`20`	`20`	`}`
`21`		-`
	`21`	+````
`22`	`22`	`而使用相同的代码时,第二个矩阵却执行了259.152s`
`23`		-`
	`23`	+````java
`24`	`24`	`Random r = new Random();`
`25`	`25`	`for (int i = 0; i < 1000; i++) {`
`26`	`26`	`for (int j = 0; j < 1000; j++) {`
`@@ -33,7 +33,7 @@ for (int i = 0; i < 1000; i++) {`
`33`	`33`
`34`	`34`	`System.out.println("");`
`35`	`35`	`}`
`36`		-`
	`36`	+````
`37`	`37`	`为什么两者的执行时间会有如此巨大的差距?`
`38`	`38`	`---`
`39`	`39`	评论中一些人建议仅执行`System.out.print("#");`以及`System.out.print("B");`,前者用时7.8871s,而后者仍然在打印(即花费时间过多--译者注)

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