Java 要进行文件传输的对象数组
我需要将存储在数组中的数据传输到一个文件中,在本例中,我将该文件创建为emplo.dat。我找不到做这件事的正确方法。使用readObject传输对象不起作用,因为它是一个对象数组Java 要进行文件传输的对象数组,java,Java,我需要将存储在数组中的数据传输到一个文件中,在本例中,我将该文件创建为emplo.dat。我找不到做这件事的正确方法。使用readObject传输对象不起作用,因为它是一个对象数组 import java.io.*; import employee.*; public class ClearTechSolutions { public static void main(String[] args) { ContractEmployee[] con = new Contr
import java.io.*;
import employee.*;
public class ClearTechSolutions {
public static void main(String[] args) {
ContractEmployee[] con = new ContractEmployee[3];
PermanentEmployee[] per = new PermanentEmployee[3];
for(int i=0;i<3;i++) {
con[i] = new ContractEmployee();
per[i] = new PermanentEmployee();
}
con[0].setData( "C001", "Mohan", "E-32 M.G Marg", "30/Jun/1974", 0.0f, 1000.0f, 0.0f, 5000.0f, 20, 7);
con[1].setData( "C002", "Steve", "A-32 M.G. Marg", "15/Oct/1981", 0.0f, 1500.0f, 0.0f, 7500.0f, 22, 3);
con[2].setData( "C003", "Mary", "A-31 Rohini", "15/Dec/1979", 0.0f, 2500.0f, 0.0f, 10000.0f, 18, 5);
per[0].setData( "E001", "Bob", "E-12 Lajpat Nagar", "01/Feb/1974", 0.0f, 20000.0f, 0.0f, 800000.0f, 7, 28);
per[1].setData( "E002", "Kevin", "E-15 Mandir Marg", "01/Apr/1990", 0.0f, 25000.0f, 0.0f, 1000000.0f, 6, 26);
per[2].setData( "E003", "Mohan", "E-15 Mandir marg", "31/July/1984",0.0f, 10000.0f, 0.0f, 400000.0f,9,30);
con[0].calc(1000.0f);
con[1].calc(1500.0f);
con[2].calc(2500.0f);
per[0].calc(20000.0f);
per[1].calc(25000.0f);
per[2].calc(10000.0f);
try {
File file = new File("emplo.dat");
file.createNewFile();
FileOutputStream fi = new FileOutputStream(file);
ObjectOutputStream obj = new ObjectOutputStream(fi);
for(int i=0;i<3;i++) {
System.out.println("\n");
System.out.println("The details for Contract Employee "+(i+1)+" are:");
con[i].print();
}
for(int i=0;i<3;i++) {
System.out.println("\n");
System.out.println("The details for Permanent Employee "+(i+1)+" are:");
per[i].print();
}
}
catch(IOException e) {}
}
}
import java.io.*;
输入雇员*;
公共类ClearTechSolutions{
公共静态void main(字符串[]args){
ContractEmployee[]con=新的ContractEmployee[3];
永久员工[]per=新的永久员工[3];
对于ethrbunny建议的(inti=0;i),您可能应该了解有关序列化的更多信息
对于这个问题,你应该
确保ContractEmployee类和PermanentEmployee类
实现可序列化接口
使用ObjectOutputStream“obj”
创建的实例,调用obj.writeObject(con)
或
obj.writeObject(per)
写入数组中所需的数据
进入文件
请注意,您向文件中写入了一个对象数组,而不是一个接一个地写入单个对象。因此,在反序列化时,还需要返回一个对象数组
import java.io.*;
import employee.*;
public class ClearTechSolutions {
public static void main(String[] args) {
ContractEmployee[] con = new ContractEmployee[3];
PermanentEmployee[] per = new PermanentEmployee[3];
for(int i=0;i<3;i++) {
con[i] = new ContractEmployee();
per[i] = new PermanentEmployee();
}
con[0].setData( "C001", "Mohan", "E-32 M.G Marg", "30/Jun/1974", 0.0f, 1000.0f, 0.0f, 5000.0f, 20, 7);
con[1].setData( "C002", "Steve", "A-32 M.G. Marg", "15/Oct/1981", 0.0f, 1500.0f, 0.0f, 7500.0f, 22, 3);
con[2].setData( "C003", "Mary", "A-31 Rohini", "15/Dec/1979", 0.0f, 2500.0f, 0.0f, 10000.0f, 18, 5);
per[0].setData( "E001", "Bob", "E-12 Lajpat Nagar", "01/Feb/1974", 0.0f, 20000.0f, 0.0f, 800000.0f, 7, 28);
per[1].setData( "E002", "Kevin", "E-15 Mandir Marg", "01/Apr/1990", 0.0f, 25000.0f, 0.0f, 1000000.0f, 6, 26);
per[2].setData( "E003", "Mohan", "E-15 Mandir marg", "31/July/1984",0.0f, 10000.0f, 0.0f, 400000.0f,9,30);
con[0].calc(1000.0f);
con[1].calc(1500.0f);
con[2].calc(2500.0f);
per[0].calc(20000.0f);
per[1].calc(25000.0f);
per[2].calc(10000.0f);
try {
File file = new File("emplo.dat");
file.createNewFile();
FileOutputStream fi = new FileOutputStream(file);
ObjectOutputStream obj = new ObjectOutputStream(fi);
for(int i=0;i<3;i++) {
System.out.println("\n");
System.out.println("The details for Contract Employee "+(i+1)+" are:");
con[i].print();
obj.writeObject(con[i]); <-- this will write your object to file connected to file output stream.
}
for(int i=0;i<3;i++) {
System.out.println("\n");
System.out.println("The details for Permanent Employee "+(i+1)+" are:");
per[i].print();
obj.writeObj(per[i]);
}
}
catch(IOException e) {}
}
}
这里abc是您要检索其对象的类名。fin in file input stream object。原语数组也是一个对象。传输到文件
意味着写入到文件?我想这就是它的意思。问题在于该语言。哦,忘了提一下。您的类必须实现可序列化才能使用序列化概念。
ObjectInputStream ois=new ObjectInputStream(fin);
abc temp;
while((temp=(abc)ois.readObject()))
{
System.out.println(temp);
}