java try finally

最新推荐文章于 2024-06-09 00:41:26 发布

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最新推荐文章于 2024-06-09 00:41:26 发布

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分类专栏： java 综合文章标签： Java C C++ C#

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本文通过三个具体的Java示例，详细解析了Java中try-catch-finally语句块的工作原理，特别是return和System.exit(0)在finally块执行前的影响。

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如下面的代码，结果就不解释了。

Java代码
public class TryTest
{
public static void main(String[] args)
{
TryTest tt = new TryTest();

tt.test1();

System.out.println();

tt.test2();

System.out.println();

tt.test3();
}

public void test1()
{
int a = 2;

System.out.println("start");

try
{
a = a/0;

}catch(Exception e)
{
System.out.println("catch");

}finally
{
System.out.println("finally");
}

System.out.println("end");
}

public void test2()
{
int a = 2;

System.out.println("start");

try
{
a = a/0;

}catch(Exception e)
{
System.out.println("catch");

return;

}finally
{
System.out.println("finally");
}

System.out.println("end");
}

public void test3()
{
int a = 2;

System.out.println("start");

try
{
a = a/0;

}catch(Exception e)
{
System.out.println("catch");

System.exit(0);

}finally
{
System.out.println("finally");
}

System.out.println("end");
}

public void test()
{
//只有final可以使用
final int a = 1;
// static int b = 2;
// final static int c = 3;
// private int d = 4;
}
}

public class TryTest
{
public static void main(String[] args)
{
TryTest tt = new TryTest();

tt.test1();

System.out.println();

tt.test2();

System.out.println();

tt.test3();
}

public void test1()
{
int a = 2;

System.out.println("start");

try
{
a = a/0;

}catch(Exception e)
{
System.out.println("catch");

}finally
{
System.out.println("finally");
}

System.out.println("end");
}

public void test2()
{
int a = 2;

System.out.println("start");

try
{
a = a/0;

}catch(Exception e)
{
System.out.println("catch");

return;

}finally
{
System.out.println("finally");
}

System.out.println("end");
}

public void test3()
{
int a = 2;

System.out.println("start");

try
{
a = a/0;

}catch(Exception e)
{
System.out.println("catch");

System.exit(0);

}finally
{
System.out.println("finally");
}

System.out.println("end");
}

public void test()
{
//只有final可以使用
final int a = 1;
// static int b = 2;
// final static int c = 3;
// private int d = 4;
}
}

输出为：

Java代码
start
catch
finally
end

start
catch
finally

start
catch