int i; // Concatenate "i" with an empty string; conversion is handled for you. String s1 = "" + i; 或: // The valueOf class method. String s2 = String.valueOf(i); 每个Number子类都包含一个类方法toString(),它将其基本类型转换为字符串,例如: int i; double d; String s3 = Integer...
publicclassStringToNumberUtils{publicstaticintstringToInt(Stringstr){try{returnInteger.parseInt(str);}catch(NumberFormatExceptione){System.err.println("Invalid input for conversion to int: "+str);return0;// 或选择抛出异常}}publicstaticdoublestringToDouble(Stringstr){try{returnDouble.parseDouble(str);}...
intnumber=789;StringstrNumber=number+"";System.out.println("使用字符串拼接转化结果: "+strNumber); 1. 2. 3. 方法四:使用String.format() 在格式化输出时,可以使用String.format()方法,这对于需要特定格式的字符串输出尤其有用。 intnumber=101;StringstrNumber=String.format("%d",number);System.out.pr...
int i = Integer.parseInt(str); String to double : double d = Double.valueOf(str).doubleValue(); String to long : long l = Long.valueOf(str).longValue(); or long l = Long.parseLong(str); String to float : float f = Float.valueOf(str).floatValue(); decimal to binary : int ...
There are several easy ways to convert a number to a string: int i; // Concatenate "i" with an empty string; conversion is handled for you. String s1 = "" + i; or // The valueOf class method. String s2 = String.valueOf(i); Each of the Number subclasses includes a class ...
{ char c = test.charAt( i );int i = (int) c;System.out.println(i);} integer to boolean :b = (i != 0);boolean to = note :To catch illegal number conversion, try using the try/catch mechanism.
当Java 在将 String 字符串转换为数字的时候,如果遇到没有办法转换的情况,Java 将会抛出一个 NumberFormatException 异常。 NumberFormatException 这个异常是 Java 中的一个 unchecked 类型异常,因此程序不会被要求强制进行处理。 在本页面中,我们对 NumberFormatException 这个异常进行一些简要说明和我们应该如何避免这个异...
static String PERCENT_ID The message identifier of the FacesMessage to be created if the conversion to Number fails. static String STRING_ID The message identifier of the FacesMessage to be created if the conversion of the Number value to String fails. Fields inherited from interface javax.face...
Main.java void main() { int numOfApples = 16; String msg = "There are " + numOfApples + " apples"; System.out.println(msg); } The example uses string concatenation to do int to String conversion. Internally, Java compiler uses StringBuilder to do the conversion. ...
下面是一个例子：```javapublic class DoubleConversionExample {public static void main(String[] args...