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String s=0.12  ת»»³É 12%
String a=0.125  ת»»³É 12.5%
String b=0.5    ת»»³É 50%

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NumberFormat.getPercentInstance().format(s);

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Java code:

java.text.NumberFormat nf=java.text.NumberFormat.getPercentInstance();
nf.setMinimumFractionDigits(2);
System.out.println(nf.format(0.125));

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String.valueOf((Double.valueOf(a).doubleValue()*100)+"%");

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