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Java 使用Formattable接口实现自定义格式化程序
使用Formattable接口实现自定义格式化程序
实例源码：
源代码：
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/** 时代Java - N o w J a v a . c o m 提 供 **/2
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import java.util.Formattable;4
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import java.util.FormattableFlags;6
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import java.util.Formatter;8
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public class Main {11
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public static void main(String[] argv) {13
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FormattablePerson fp = new FormattablePerson("Ken", "Smith");15
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System.out.printf("%s %n", fp);17
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System.out.printf("%#s %n", fp);19
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System.out.printf("%S %n", fp);21
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System.out.printf("%#S %n", fp);23
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}25
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}27
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class FormattablePerson implements Formattable {30
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private String firstName = "Unknown";32
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private String lastName = "Unknown";34
/* 来自 n o w j a v a . c o m*/35
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public FormattablePerson(String firstName, String lastName) {37
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this.firstName = firstName;39
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this.lastName = lastName;41
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}43
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// Other code goes here...46
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public void formatTo(Formatter formatter, int flags, int width, int precision) {49
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String str = this.firstName + " " + this.lastName;51
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int alternateFlagValue = FormattableFlags.ALTERNATE & flags;54
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if (alternateFlagValue == FormattableFlags.ALTERNATE) {56
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str = this.lastName + ", " + this.firstName;58
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}60
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// Check if uppercase variant of the conversio is being used63
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int upperFlagValue = FormattableFlags.UPPERCASE & flags;65
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