Java 中的整数 toString()
-
The java.lang.Integer.toString() is an inbuilt method in Java which is used to return the String object representing this Integer’s value.
语法:
java public static String toString()参数:该方法不接受任何参数。
返回值:该方法返回特定整数值的字符串对象。
下面的程序说明了 Java.lang.Integer.toString()方法:
```java // Java program to illustrate the // toString() Method import java.lang.*;
public class Geeks{
public static void main(String[] args) {
Integer obj = new Integer(8);
//It will return a string representation String stringvalue1 = obj.toString(); System.out.println("String Value= " + stringvalue1);
Integer obj3 = new Integer(10);
//It will return a string representation String stringvalue3 = obj3.toString(); System.out.println("String Value = " + stringvalue3);
} } ```
Output:
```java String Value= 8 String Value = 10
```
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The java.lang.Integer.toString(int a) is an inbuilt method in Java which is used to return a String object, representing the specified integer in the parameter. Syntax :
java public static String toString(int *a*)参数:该方法接受一个整数类型的参数 a ，指需要转换为字符串的整数。
返回值:该方法返回特定基中参数的字符串表示形式。
示例:
```java For base 8: Input: int a = 75 Output: "75"
For base 10: Input: int a = -787 Output: "-787"
```
以下程序说明了 Java . lang . integer . tostring(int a)方法: 程序 1:
```java // Java program to illustrate the // toString(int a) method import java.lang.*;
public class Geeks{
public static void main(String[] args) {
Integer obj = new Integer(8);
// It will return a string representation // in base 8 String stringvalue1 = obj.toString(75); System.out.println("String Value = " + stringvalue1);
Integer obj2 = new Integer(8);
// It will return a string representation // in base 2 String stringvalue2 = obj2.toString(6787); System.out.println("String Value = " + stringvalue2);
Integer obj3 = new Integer(10);
// It will return a string representation // in base 10 String stringvalue3 = obj3.toString(-787); System.out.println("String Value = " + stringvalue3);
} } ```
Output:
```java String Value = 75 String Value = 6787 String Value = -787
```
程序 2: 用于十进制和字符串参数。 注意:这将导致一个错误，以及缺少合适的整数构造函数。
```java // Java program to illustrate the // Java.lang.Integer.toString(int a)method import java.lang.*; public class Geeks{
public static void main(String[] args) { Integer obj = new Integer(8); String stringvalue1 = obj.toString(58.5); System.out.println("String Value = " + stringvalue1);
Integer obj2 = new Integer(8); String stringvalue2 = obj2.toString("317"); System.out.println("String Value = " + stringvalue2);
// Empty constructor will result in an error Integer obj3 = new Integer(); String stringvalue3 = obj3.toString(-787); System.out.println("String Value = " + stringvalue3);
} } ```
输出:
java prog.java:8: error: incompatible types: possible lossy conversion from double to int String stringvalue1 = obj.toString(58.5); ^ prog.java:12: error: incompatible types: String cannot be converted to int String stringvalue2 = obj2.toString("317"); ^ prog.java:17: error: no suitable constructor found for Integer(no arguments) Integer obj3 = new Integer(); ^ constructor Integer.Integer(int) is not applicable (actual and formal argument lists differ in length) constructor Integer.Integer(String) is not applicable (actual and formal argument lists differ in length) Note: Some messages have been simplified; recompile with -Xdiags:verbose to get full output 3 errors -
The java.lang.Integer.toString(int a, int base) is an inbuilt method in Java which is used to return a string representation of the argument a in the base, specified by the second argument base. If the radix/base is smaller than Character.MIN_RADIX or larger than Character.MAX_RADIX, then the base 10 is used. The ASCII characters which are used as digits: 0 to 9 and a to z. Syntax:
java public static String toString(int a, int base)参数:该方法接受两个参数:
- a :这是整数类型，指的是要转换的整数值。
- 基数:这也是整数类型，指的是表示字符串时要使用的基数。
返回值:该方法返回指定基中指定参数的字符串表示形式。
示例:
```java Input: a = 71, base = 2 Output: 1000111
Input: a = 314, base = 16 Output: 13a
```
下面的程序说明了方法: 程序 1:
```java // Java program to illustrate the // toString(int, int) Method import java.lang.*;
public class Geeks{
public static void main(String[] args) {
Integer a = new Integer(10);
// It returns a string representation // in base 2 String returnvalue = a.toString(5254, 2); System.out.println("String Value = " + returnvalue);
// It returns a string representation // in base 8 returnvalue = a.toString(35, 8); System.out.println("String Value = " + returnvalue);
// It returns a string representation // in base 16 returnvalue = a.toString(47, 16); System.out.println("String Value = " + returnvalue);
// It returns a string representation // in base 10 returnvalue = a.toString(451, 10); System.out.println("String Value = " + returnvalue); } } ```
Output:
```java String Value = 1010010000110 String Value = 43 String Value = 2f String Value = 451
```
程序 2:
```java // Java program to illustrate the // toString(int, int) Method import java.lang.*;
public class Geeks{
public static void main(String[] args) {
Integer a = new Integer(10);
// It returns a string representation // in base 2 String returnvalue = a.toString(-525, 2); System.out.println("String Value = " + returnvalue);
// It returns a string representation // in base 8 returnvalue = a.toString(31, 8); System.out.println("String Value = " + returnvalue);
// It returns a string representation // in base 16 returnvalue = a.toString(28, 16); System.out.println("String Value = " + returnvalue);
// It returns a string representation // in base 10 returnvalue = a.toString(29, 10); System.out.println("String Value = " + returnvalue); } } ```
Output:
```java String Value = -1000001101 String Value = 37 String Value = 1c String Value = 29
```
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