Programming Tutorials

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How to modify the objects using java classes

By: Issac in Java Tutorials on 2009年09月14日 [フレーム]

In this tutorial we are going to see how to modify the objects using java classes.

class ClassA
 {
 private int data;
 public ClassA(int startingVal)
 {
 data = startingVal;
 }
 public ClassA add(int x)
 {
 data += x;
 return this;
 }
 public ClassA multiply(int x)
 {
 data *= x;
 return this;
 }
 public ClassB makeClassB()
 {
 return new ClassB(data);
 }
}
public class ClassB
 {
 private int data;
 public ClassB(int startingVal)
 {
 data = startingVal;
 }
 public int read()
 {
 return data;
 }
 public boolean nonzero()
 {
 return data != 0;
 }
 public ClassB add(int x)
 {
 return new ClassB(data + x);
 }
 public ClassB multiply(int x)
 {
 return new ClassB(data * x);
 }
 public ClassA makeClassA()
 {
 return new ClassA(data);
 }
 public static ClassB modify1(ClassB y)
 {
 ClassB val = y.add(9);
 val = val.multiply(2);
 val = val.add(11);
 val = val.multiply(2);
 return val;
 }
 public static ClassB modify2(ClassB y)
 {
 ClassA m = y.makeClassA();
 m.add(9).multiply(2).add(11).multiply(2);
 return m.makeClassB();
 }
 public static void main(String[] args) {
 ClassB i2 = new ClassB(7);
 ClassB r1 = modify1(i2);
 ClassB r2 = modify2(i2);
 System.out.println("i2 = " + i2.read());
 System.out.println("r1 = " + r1.read());
 System.out.println("r2 = " + r2.read());
 }
}

Output:

i2=7
r1=86
r2=86

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