This article gives you a detailed introduction to the mutual conversion between string and int in Java through example code. Friends who are interested can take a look together
int -> String
int i=12345; String s="";
Core: s=i+"";
String -> int
s="12345"; int i;
Core:i=Integer.parseInt(s);
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package com.fry.util; public class Transfer { public void stringToInt(){ String id="20171091"; int n=Integer.parseInt(id); System.out.println(n); } }The test result of this method is 20171091 . The following reference:
Conversion of string and int in java
1 How to convert a string String into an integer int ?A. There are two methods: 1). int i = Integer.parseInt([String]); or i = Integer.parseInt([String] ],[int radix]);2). int i = Integer.valueOf(my_str).intValue();Note: Method to convert string to Double, Float, Long Much the same.2 How to convert an integer into a string String?A. There are three methods:1.) String s = String.valueOf(i) ;2.) String s = Integer.toString(i);3.) String s = "" + i;Note: Double, Float, Long The methods of converting into strings are similar.int -> String int i=12345; String s="";The first method: s=i+"";The second method: s=String. valueOf(i);What is the difference between these two methods? Are the effects the same? Are they interchangeable under any circumstances?
String -> int s="12345"; int i;The first method: i=Integer.parseInt(s);
The second method: s=String.valueOf(i ); //Use the static method of the String class directly to generate only one object
The second method: i=Integer.valueOf(s).intValue();//Integer.valueOf(s) is equivalent to new Integer(Integer.parseInt(s)), which will also be thrown
1How to convert a string String into an integer int?
A. There are two methods:1). int i = Integer.parseInt([String]) ; orNote: The methods for converting strings into Double, Float, and Long are similar.
2 How to convert integer into word String ?
Note: Double, Float, Long are converted into strings The methods are similar.
JAVA data type conversionKeyword Type conversionThis is an example, talking about the conversion of data types in JAVA. Provided Everyone learns how to use common data type conversion functions in JAVApackage cn.com.lwkj.erts.register; import java.sql.Date; public class TypeChange { public TypeChange() { } //change the string type to the int type public static int stringToInt(String intstr) { Integer integer; integer = Integer.valueOf(intstr); return integer.intValue(); } //change int type to the string type public static String intToString(int value) { Integer integer = new Integer(value); return integer.toString(); } //change the string type to the float type public static float stringToFloat(String floatstr) { Float floatee; floatee = Float.valueOf(floatstr); return floatee.floatValue(); } //change the float type to the string type public static String floatToString(float value) { Float floatee = new Float(value); return floatee.toString(); } //change the string type to the sqlDate type public static java.sql.Date stringToDate(String dateStr) { return java.sql.Date.valueOf(dateStr); } //change the sqlDate type to the string type public static String dateToString(java.sql.Date datee) { return datee.toString(); } public static void main(String[] args) { java.sql.Date day ; day = TypeChange.stringToDate("2003-11-3"); String strday = TypeChange.dateToString(day); System.out.println(strday); } }Although they can all be found in the JAVA API, organize them and make a backup. Summarize
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