OOP08-Java字符串与其它类型的转换

数据类型转换

字符串转数字/逻辑类型

String转int用Integer.parseInt()

String转double用Double.parseDouble()

String转boolean用Boolean.parseBoolean()

示例如下:

public class Convert {
public static void main(String[] args) {
int age = Integer.parseInt("120");
age++;
double height = Double.parseDouble("1.72");
height += 0.01;
boolean isStudent = Boolean.parseBoolean("false");
isStudent = isStudent || true;
System.out.println("age=" + age);
System.out.println("height=" + height);
System.out.println("isStudent=" + isStudent);
}
}

运行结果:

age=121
height=1.73
isStudent=true

数字/逻辑类型转字符串

任何类型转String一律用String.valueOf().

示例如下:

public class ConvertToString {
public static void main(String[] args) {
String age = String.valueOf(120);
String height = String.valueOf(1.73);
String isStudent = String.valueOf(true);
System.out.println("age=" + age);
System.out.println("height=" + height);
System.out.println("isStudent=" + isStudent);
}
}

运行结果:

age=120
height=1.73
isStudent=true