Detailed explanation of string data type conversion in JAVA

In JAVA, string is a final class, and the provided string cannot be modified. The string type is often used in projects. The following introduces the more commonly used string data type conversion:

String data type conversion to long , int, double, float, boolean, char and other seven data types

* 数据类型转换
* @author Administrator
*
*/
public class 数据类型转换 {
public static void main(String[] args) {
String c="123456";

//When String type data is to be converted into int, double, float, long and other data types, the data must be composed of numbers.
//When String type data consists of Chinese characters or letters and is converted into int, double, float, long and other data types, the program reports an error

##//String type Convert to long type

//String类型数据转换成long类型时 String类型的数据必须是数字构成
long n=Long.parseLong(c);
System.out.println("String类型转换成long型："+n);

//Convert String to int type

//String类型数据转换成int类型时 String类型的数据必须是数字构成
int i=Integer.parseInt(c);
System.out.println("String转换成int类型："+i);

//Convert String to double type

//String类型数据转换成double类型时 String类型的数据必须是数字构成
double m=Double.parseDouble(c);
System.out.println("String转换成double类型："+m);

//Convert String type to float type

//String类型数据转换成float类型时 String类型的数据必须是数字构成
float M=Float.parseFloat(c);
System.out.println("String类型转换成类型float类型："+M);

//Converting the String type to the Object type does not involve conversion and assigning the String value directly to the Object

Object L=c;
System.out.println("String转换成Object："+L);

//Converting the String type to the boolean type

String C="true";
//当String类型数据值为true/false时，直接输出true/false
boolean N=Boolean.parseBoolean(+C);
System.out.println("String类型转换成boolean类型："N);
//当String类型数据值为数字、字符、汉字或混合构成，则输出false
boolean o=Boolean.parseBoolean(c);
System.out.println("String类型转换成boolean类型："+o);

//String type Convert data to char type data

//当String类型数据转换成char类型数据时，需要用一个char类型的数组来接受
char[] O=c.toCharArray();
System.out.print("String类型数据转换成char类型数据：");
for(int num=0;num<O.length;num++){
System.out.print(O[num]+"\t");
}
System.out.println("\n");

//Convert int, double, boolean, char, float, long, Object type data to String

//Convert int type to String type

int h=123456;
String l=String.valueOf(h);
System.out.println("int类型转换成String类型："+l);

//Double type to String

double a=1.1;
String A=String.valueOf(a);
System.out.println("double类型转String："+A);

//Boolean type to String type

boolean b=false;
String B=String.valueOf(b);
System.out.println("boolean类型转String类型："+b);

//Char type to String type

char d='a';
String D=String.valueOf(d);
System.out.println("char类型转String类型："+d);

//Char type array to String Type

char[] e={'a','b','c'};
String E=String.valueOf(e);
System.out.println("char类型数组转换成String类型："+E);

//Convert several data in the char type array to String type

char []f={'a','b','c','d'};
String F=String.valueOf(f, 0, 3);
System.out.println("char类型数组中其中几个数据转换成String类型："+F);

//Convert float type to String type

float g=123;
String G=String.valueOf(g);
System.out.println("float类型转换成String类型："+G);

//Convert long type to String type

long j=123342;
String J=String.valueOf(j);
System.out.println("long类型转换成String类型："+J);

//Convert Object type to String type

Object k=c;
String K=String.valueOf(k);
System.out.println("Object类型转换成String类型："+K);
System.out.println("\n");

The above code is a detailed explanation of string data type conversion in JAVA. I hope you like it.

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