This page presents a side-by-side comparison between a small COBOL program and the equivalent Java code produced by SoftwareMining's COBOL to Java Converter and Refactoring Tool. It highlights how business logic and data structures are preserved while generating modern, maintainable, and object-oriented code.
The goal of this example is to demonstrate the readability, maintainability, and structural clarity of the translated code. This simple example does not attempt to show advanced features such as the removal of GO TO statements, dead-code elimination, handling of REDEFINEs, CICS integration, or pointer translation.
For details on how these advanced cases are handled, see our comprehensive guide: COBOL to Java / C# Conversion FAQ for Java Projects .
PROGRAM-ID. LOAN.
DATA DIVISION.
FILE SECTION.
WORKING-STORAGE SECTION.
01 WS-DATA.
05 PRINCIPAL PIC 9(9) VALUE 0.
05 INTEREST-RATE PIC 99V99 VALUE 0.
05 LOAN-LENGTH PIC 99 VALUE 0.
05 NEXT-INTEREST PIC 99V99.
05 NEXT-YEAR PIC 99.
01 CLIENT-RECORD.
05 NAME PIC X(20).
05 ADDRESS PIC X(20) OCCURS 3 TIMES.
05 ID PIC 9(4) COMP.
...
// Sample COBOL to Java translated code
public class Loan extends BaseService {
// Notes: 01 level WS-DATA name is simplified (Optional)
// and converted to a DAO
// The DAO handles REDEFINES, COMP, OCCURS-DEPENDING, ...
private WsData data = new WsData(this);
// Client-RECORD has been translated to ClientRecord DAO,
// but since the program does not reference ClientRecord,
// it will automatically be commented out.
// private ClientRecord clientRecord = new ClientRecord(this);
...
* Main entry point to program
LOAN-MAIN-001.
* -
* CLEAR SCREEN AND READ DATA
* -
IF LOAN-LENGTH > 4 THEN
COMPUTE START-YEAR = LOAN-LENGTH - 4
ELSE
COMPUTE START-YEAR = 0.
IF INTEREST-RATE > 0.4 THEN
COMPUTE START-INTEREST = INTEREST-RATE - 0.4
ELSE
COMPUTE START-INTEREST = 0
END-IF
MOVE 1 TO YEAR-ROW.
* -
* GO THRU THE NUMBER OF YEARS
* -
MOVE "% Rate->" TO DSP-NO-YRS(1).
MOVE START-YEAR TO NEXT-YEAR
PERFORM VARYING YEAR-ROW FROM 2 BY 1 UNTIL YEAR-ROW = 11
PERFORM DO-NEXT-ROW
ADD 1 TO NEXT-YEAR
END-PERFORM.
* -
* AND EXIT
* -
STOP RUN.
/**
* Main entrance to program
*/
protected void loanMain () {
// -
// CLEAR SCREEN AND READ DATA
// -
if (data.getLoanLength() > 4) {
data.setStartYear(data.getLoanLength() - 4);
} else {
data.setStartYear(0);
}
if (data.getInterestRate() > 0.4) {
data.setStartInterest(data.getInterestRate() - 0.4);
} else {
data.setStartInterest(0.0);
}
data.setYearRow(1);
// -
// GO THRU THE NUMBER OF YEARS
// -
displayResult.setNoYrs(0, "% Rate->");
data.setNextYear(data.getStartYear());
// initialize loop variable
data.setYearRow(2);
while (data.getYearRow() != 11) {
doNextRow();
data.setNextYear(data.getNextYear() + 1);
data.setYearRow(data.getYearRow() + 1);
}
// -
// AND EXIT
// -
stop();
}
*
* Calculates values for individual rows
*
DO-NEXT-ROW.
MOVE START-INTEREST TO NEXT-INTEREST
PERFORM VARYING INTEREST-COL FROM 1 BY 1
UNTIL INTEREST-COL = 10
MOVE NEXT-INTEREST TO DSP-RESULT(1, INTEREST-COL)
PERFORM CALCULATE
MOVE NEXT-RESULT TO DSP-RESULT(YEAR-ROW, INTEREST-COL)
ADD 0.1 TO NEXT-INTEREST
END-PERFORM.
/**
* Calculates values for individual rows
*/
protected void doNextRow () {
data.setNextInterest(data.getStartInterest());
data.setInterestCol(1);
while (data.getInterestCol() != 10) {
displayResult.setResult(
0,
data.getInterestCol() - 1,
data.getNextInterest()
);
calculate();
displayResult.setResult(
data.getYearRow() - 1,
data.getInterestCol() - 1,
data.getNextResult()
);
data.setNextInterest(data.getNextInterest() + 0.1);
data.setInterestCol(data.getInterestCol() + 1);
}
}
*
* The next paragraph calculates CELL values
*
CALCULATE.
COMPUTE INTDEC = NEXT-INTEREST / (12.0 * 100.0)
COMPUTE NUMMONTHS = NEXT-YEAR * 12.0
...
/**
* The next paragraph calculates CELL values
*/
protected void calculate () {
data.setIntdec(data.getNextInterest() / (12.0 * 100.0));
data.setNummonths((double) data.getNextYear() * 12.0);
...
}
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