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update java安全指南.md, logcat输出字符串判断问题 #71

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update java安全指南.md, logcat输出字符串判断问题 #71

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7 changes: 4 additions & 3 deletions Java安全指南.md
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Original file line number Diff line number Diff line change
Expand Up @@ -89,11 +89,12 @@ public class MainActivity extends Activity {
release 版本禁止在 logcat 输出信息。
```java
public class MainActivity extends Activity {
String DEBUG = "debug_version";

boolean DEBUG = true; // 示例代码，实际场景中建议设置为全局变量
protected void onCreate(Bundle savedInstanceState) {
// ......
if (DEBUG == "debug_version") {
// equals() 方法比较字符串对象中的字符。而==运算符比较两个对象引用看它们是否引用相同的实例。如果要做字符串内容比较，应该用equals()，不能用if (DEBUG == "debug_version")，且写代码“debug_version”这个字符串过长容易写错，出问题也不好发现
// 另外，字符串比较效率比较低，不如直接用boolean
if (DEBUG) {
Log.d("writelog", "start activity");
}
// ......
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