Shulou(Shulou.com)06/01 Report--

The purpose of this article is to share with you what are the basic interview questions about the Java language. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

1. Can multiple classes (not inner classes) be included in a ".java" source file? What are the restrictions?

There can be multiple classes, but there can only be one public class, and the class name of the public must match the file name.

2. Does Java have goto?

Reserved words in java are not currently used in java. L

3. Talk about the difference between & and &.

Both & and & & can be used as operators of logical and to represent logical and (and). When the result of expressions on both sides of the operator is true, the whole result is true, otherwise, as long as one side is false, the result is false.

& & also has the function of short circuit, that is, if the first expression is false, the second expression will not be evaluated. For example, for the if (stringency = null&&! str.equals (s)) expression, when str is null, the following expression will not be executed, so there will be no NullPointerException if you change & & to &, then a NullPointerException exception will be thrown. If (xylene 33 & + + y > 0) y will grow, but If (xylene 33 & & + + y > 0) will not grow.

& can also be used as a bit operator. When the expressions on both sides of the & operator are not of type boolean, & means bitwise and operation.We usually use 0x0f to operate on an integer to get the lowest 4 bit bits of the integer. For example, the result of 0x31 & 0x0f is 0x01.

4. How to jump out of the current multiple nested loops in JAVA?

In Java, to jump out of multiple loops, you can define a label in front of the outer loop statement, and then use the labeled break statement in the code of the inner loop body to jump out of the outer loop.

For example:

For (int iTuno Bandi)

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