Table of contents
1. String (String) to integer (int):
2. Integer (int) to string (String):
3. String (String) to floating point number (float):
4. Floating point number (float) to string (String):
5. String (String) to Boolean (boolean):
6. Boolean (boolean) to string (String):
7. String (String) to character array (char[]):
8. Character array (char[]) to character string (String):
When it comes to converting between data types, Android provides many built-in methods and operators to simplify the process. Below are some common data type conversion examples, including comments to help you understand.
1. String (String) to integer (int):
String str = "123";
int num = Integer.parseInt(str); // 将字符串转换为整数
2. Integer (int) to string (String):
int num = 123;
String str = Integer.toString(num); // 将整数转换为字符串
3. String (String) to floating point number (float):
String str = "3.14";
float num = Float.parseFloat(str); // 将字符串转换为浮点数
4. Floating point number (float) to string (String):
float num = 3.14f;
String str = Float.toString(num); // 将浮点数转换为字符串
5. String (String) to Boolean (boolean):
String str = "true";
boolean bool = Boolean.parseBoolean(str); // 将字符串转换为布尔值
6. Boolean (boolean) to string (String):
boolean bool = true;
String str = Boolean.toString(bool); // 将布尔值转换为字符串
7. String (String) to character array (char[]):
String str = "hello";
char[] arr = str.toCharArray(); // 将字符串转换为字符数组
8. Character array (char[]) to character string (String):
char[] arr = {'h', 'e', 'l', 'l', 'o'};
String str = new String(arr); // 将字符数组转换为字符串9. Convert boolean to integer
In Java, Boolean values can be implicitly converted to integer types. When boolean true, it is converted to integer 1; when boolean false, it is converted to integer 0. Here is an example:
boolean bool = true;
int num = bool ? 1 : 0; // 将布尔值转换为整数
In the above example, ?:the boolean value is boolconverted to an integer using the conditional operator. If boolyes true, the integer 1is assigned to num; if boolyes false, the integer 0is assigned to num.
This implicit conversion can be used in many situations, such as using boolean values for mathematical operations, assignment operations, etc. If you need to convert a Boolean value to a String type, you can use the Boolean toString()method.