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How to debug a program in java

The method of debugging a program in Java is: first set a breakpoint where you need to debug, and start debugging. If it is a web program, you need to start the server in Debug mode, and then run the program to debug. The program can be modified according to the debugging information.

Nov 20, 2019 pm 05:15 PM

java program debug

Solution to garbled Chinese SQL statements in Java

Garbled characters when inserting SQL statements in Java can be solved by adding the encoding format UTF-8 in DriverManage. Garbled characters can generally be solved by modifying the encoding format.

Nov 20, 2019 pm 05:05 PM

java

How to jump out or terminate if statement in java

The method to jump out or terminate the if statement in Java is: first, you can use break to jump out of the current loop, but if it is a nested loop, you can only jump out of the current loop. You can also use continue to terminate the current loop, but not jump out of the loop.

Nov 20, 2019 pm 05:04 PM

if statement java method termination Jump out

Java writes files that are garbled

The solution to garbled code when writing files in Java: first create a writeFile method; then specify the encoding format within the method; and finally write the file through OutputStreamWriter.

Nov 20, 2019 pm 05:03 PM

java Garbled characters write file

How to initialize objects in java

The process of object initialization in Java is: first, the class is loaded and the static members of the class are initialized, and then the object of the class is created and the ordinary members of the class are initialized.

Nov 20, 2019 pm 04:33 PM

java initialization object

How to determine whether a table exists in java?

Methods to determine whether a table exists in java: 1. Use JdbcTemplate query to determine whether the table exists. 2. Use the Connection object to connect the table to determine whether the table exists.

Nov 20, 2019 pm 04:27 PM

java

Java determines whether it is a folder

In java, you can use isDirectory() to determine whether it is a folder. isDirectory() checks whether an object is a folder. The return value is of type boolean. Returns true if so, false otherwise.

Nov 20, 2019 pm 03:58 PM

java

Java determines whether strings are equal

How to determine whether strings are equal in Java: First, you can use "==" to compare references, for example: "a==b", and then you can also use the equals method to compare values, for example: "a.equals(b)", the values ??are equal then returns true.

Nov 20, 2019 pm 03:58 PM

java judgment string

How to enter a character in java

How to input characters in java: first create a Scanner object, then call the "next()" method of the Scanner object to get the string input by the console, and finally call the "charAt(0)" method of String to get the first character.

Nov 20, 2019 pm 03:46 PM

java character enter

Solution to Java reading txt garbled characters

Solution to Java reading txt garbled code: 1. Unify the encoding of java projects and txt files to utf-8. 2. Use the InputStreamReader(new FileInputStream(fileUrl), "utf-8") method to set the txt text encoding to utf-8 .

Nov 20, 2019 pm 03:43 PM

java

How to determine whether it is a number in java

Methods to determine whether it is a number in Java: 1. Use the regular expression "[0-9]*" to determine. 2. Use the function isNumeric() that comes with java to determine. 3. Judge by ASCII code value.

Nov 20, 2019 pm 03:31 PM

java

How to write if statement in java

The writing methods of if statements in java are: 1. "if (boolean type expression) {...}"; 2. "if (condition) {...}else{...}"; 3. "if (condition){...}else if (condition){...}else{...}".

Nov 20, 2019 pm 03:29 PM

if java statement

Java determines whether a character is a Chinese character

Java can use regular expressions to match the unicode encoding of Chinese characters to determine whether a character is a Chinese character. The regular expression for Java to determine whether a character is a Chinese character is "[\u4e00-\u9fa5]".

Nov 20, 2019 pm 03:06 PM

java

How to write the file path in java

How to write java file path: 1. Use forward slashes to represent the path, such as "c:/desktop.txt"; 2. Use backslashes to represent the path, which needs to be escaped, such as "d:\\desktop.txt".

Nov 20, 2019 pm 02:53 PM

java path