1、append
ToStringBuilder类主要用于类的格式化输出。ToStringBuilder中append方法可以向该类添加基本类型、数组、和对象只有添加的方法才会被toString输出
import java.math.BigDecimal;
import java.util.HashSet; import java.util.Set; import java.math.BigDecimal; import org.apache.commons.lang.builder.CompareToBuilder; import org.apache.commons.lang.builder.EqualsBuilder; import org.apache.commons.lang.builder.HashCodeBuilder; import org.apache.commons.lang.builder.ToStringBuilder; class TaxReturn { private String ssn; private int year; private String lastName; private BigDecimal taxableIncome; public TaxReturn() { } public TaxReturn(String pSsn, int pYear, String pLastName, BigDecimal pTaxableIncome) { setSsn(pSsn); setYear(pYear); setLastName(pLastName); setTaxableIncome(pTaxableIncome); } public String getSsn() { return ssn; } public void setSsn(String pSsn) { ssn = pSsn; } public int getYear() { return year; } public void setYear(int pYear) { year = pYear; } public String getLastName() { return lastName; } public void setLastName(String pLastName) { lastName = pLastName; } public BigDecimal getTaxableIncome() { return taxableIncome; } public void setTaxableIncome(BigDecimal pTaxableIncome) { taxableIncome = pTaxableIncome; } public String toString() { return new ToStringBuilder(this).append("ssn", ssn).append("year", year).append("lastName", lastName).toString(); } public int hashCode() { return new HashCodeBuilder(3, 7).append(ssn).append(year).toHashCode(); } public boolean equals(Object pObject) { boolean equals = false; if (pObject instanceof TaxReturn) { TaxReturn bean = (TaxReturn) pObject; equals = (new EqualsBuilder().append(ssn, bean.ssn).append(year, bean.year)).isEquals(); } return equals; } public int compareTo(Object pObject) { return CompareToBuilder.reflectionCompare(this, pObject); } } public class MainClass { public static void main(String[] pArgs) throws Exception { TaxReturn return1 = new TaxReturn("012-68-3242", 1998, "O'Brien", new BigDecimal(43000.00)); TaxReturn return2 = new TaxReturn("012-68-3242", 1999, "O'Brien", new BigDecimal(45000.00)); TaxReturn return3 = new TaxReturn("012-68-3242", 1999, "O'Brien", new BigDecimal(53222.00)); System.out.println("ToStringBuilder: " + return1.toString()); } }
运行结果如下:
ToStringBuilder: TaxReturn@1503a3[ssn=012-68-3242,year=1998,lastName=O'Brien]
2、reflectionToString
把类对应的基本属性和值输出来。
import org.apache.commons.lang.builder.EqualsBuilder;
import org.apache.commons.lang.builder.HashCodeBuilder; import org.apache.commons.lang.builder.ToStringBuilder; import org.apache.commons.lang.builder.ToStringStyle; public class MainClass { public static void main(String[] args) { MyClass one = new MyClass("Becker", 35); MyClass two = new MyClass("Becker", 35); MyClass three = new MyClass("Agassi", 33); System.out.println("One>>>" + one); System.out.println("Two>>>" + two); System.out.println("Three>>>" + three); System.out.println("one equals two? " + one.equals(two)); System.out.println("one equals three? " + one.equals(three)); System.out.println("One HashCode>>> " + one.hashCode()); System.out.println("Two HashCode>>> " + two.hashCode()); System.out.println("Three HashCode>>> " + three.hashCode()); } } class MyClass { private String name = null; private int age = 0; public MyClass(String name, int age) { this.name = name; this.age = age; } public boolean equals(Object obj) { return EqualsBuilder.reflectionEquals(this, obj); } public String toString() { return ToStringBuilder.reflectionToString(this, ToStringStyle.MULTI_LINE_STYLE); } public int hashCode() { return HashCodeBuilder.reflectionHashCode(this); } }
运行结果如下:
One>>>MyClass@743399[
name=Becker age=35 ] Two>>>MyClass@1d8957f[ name=Becker age=35 ] Three>>>MyClass@3ee284[ name=Agassi age=33 ] one equals two? true one equals three? false One HashCode>>> 462213092 Two HashCode>>> 462213092 Three HashCode>>> -530629296